Data is the heartbeat of the digital realm. And when something is so important, you want to ensure you deal with it properly. That’s where data structures come into play.

But what is data structure exactly?

In the simplest terms, a data structure is a way of organizing data on a computing machine so that you can access and update it as quickly and efficiently as possible. For those looking for a more detailed data structure definition, we must add processing, retrieving, and storing data to the purposes of this specialized format.

With this in mind, the importance of data structures becomes quite clear. Neither humans nor machines could access or use digital data without these structures.

But using data structures isn’t enough on its own. You must also use the right data structure for your needs.

This article will guide you through the most common types of data structures, explain the relationship between data structures and algorithms, and showcase some real-world applications of these structures.

Armed with this invaluable knowledge, choosing the right data structure will be a breeze.

Types of Data Structures

Like data, data structures have specific characteristics, features, and applications. These are the factors that primarily dictate which data structure should be used in which scenario. Below are the most common types of data structures and their applications.

Primitive Data Structures

Take one look at the name of this data type, and its structure won’t surprise you. Primitive data structures are to data what cells are to a human body – building blocks. As such, they hold a single value and are typically built into programming languages. Whether you check data structures in C or data structures in Java, these are the types of data structures you’ll find.

  • Integer (signed or unsigned) – Representing whole numbers
  • Float (floating-point numbers) – Representing real numbers with decimal precision
  • Character – Representing integer values as symbols
  • Boolean – Storing true or false logical values

Non-Primitive Data Structures

Combine primitive data structures, and you get non-primitive data structures. These structures can be further divided into two types.

Linear Data Structures

As the name implies, a linear data structure arranges the data elements linearly (sequentially). In this structure, each element is attached to its predecessor and successor.

The most commonly used linear data structures (and their real-life applications) include the following:

  • In arrays, multiple elements of the same type are stored together in the same location. As a result, they can all be processed relatively quickly. (library management systems, ticket booking systems, mobile phone contacts, etc.)
  • Linked lists. With linked lists, elements aren’t stored at adjacent memory locations. Instead, the elements are linked with pointers indicating the next element in the sequence. (music playlists, social media feeds, etc.)
  • These data structures follow the Last-In-First-Out (LIFO) sequencing order. As a result, you can only enter or retrieve data from one stack end (browsing history, undo operations in word processors, etc.)
  • Queues follow the First-In-First-Out (FIFO) sequencing order (website traffic, printer task scheduling, video queues, etc.)

Non-Linear Data Structures

A non-linear data structure also has a pretty self-explanatory name. The elements aren’t placed linearly. This also means you can’t traverse all of them in a single run.

  • Trees are tree-like (no surprise there!) hierarchical data structures. These structures consist of nodes, each filled with specific data (routers in computer networks, database indexing, etc.)
  • Combine vertices (or nodes) and edges, and you get a graph. These data structures are used to solve the most challenging programming problems (modeling, computation flow, etc.)

Advanced Data Structures

Venture beyond primitive data structures (building blocks for data structures) and basic non-primitive data structures (building blocks for more sophisticated applications), and you’ll reach advanced data structures.

  • Hash tables. These advanced data structures use hash functions to store data associatively (through key-value pairs). Using the associated values, you can quickly access the desired data (dictionaries, browser searching, etc.)
  • Heaps are specialized tree-like data structures that satisfy the heap property (every tree element is larger than its descendant.)
  • Tries store strings that can be organized in a visual graph and retrieved when necessary (auto-complete function, spell checkers, etc.)

Algorithms for Data Structures

There is a common misconception that data structures and algorithms in Java and other programming languages are one and the same. In reality, algorithms are steps used to structure data and solve other problems. Check out our overview of some basic algorithms for data structures.

Searching Algorithms

Searching algorithms are used to locate specific elements within data structures. Whether you’re searching for specific data structures in C++ or another programming language, you can use two types of algorithms:

  • Linear search: starts from one end and checks each sequential element until the desired element is located
  • Binary search: looks for the desired element in the middle of a sorted list of items (If the elements aren’t sorted, you must do that before a binary search.)

Sorting Algorithms

Whenever you need to arrange elements in a specific order, you’ll need sorting algorithms.

  • Bubble sort: Compares two adjacent elements and swaps them if they’re in the wrong order
  • Selection sort: Sorts lists by identifying the smallest element and placing it at the beginning of the unsorted list
  • Insertion sort: Inserts the unsorted element in the correct position straight away
  • Merge sort: Divides unsorted lists into smaller sections and orders each separately (the so-called divide-and-conquer principle)
  • Quick sort: Also relies on the divide-and-conquer principle but employs a pivot element to partition the list (elements smaller than the pivot element go back, while larger ones are kept on the right)

Tree Traversal Algorithms

To traverse a tree means to visit its every node. Since trees aren’t linear data structures, there’s more than one way to traverse them.

  • Pre-order traversal: Visits the root node first (the topmost node in a tree), followed by the left and finally the right subtree
  • In-order traversal: Starts with the left subtree, moves to the root node, and ends with the right subtree
  • Post-order traversal: Visits the nodes in the following order: left subtree, right subtree, the root node

Graph Traversal Algorithms

Graph traversal algorithms traverse all the vertices (or nodes) and edges in a graph. You can choose between two:

  • Depth-first search – Focuses on visiting all the vertices or nodes of a graph data structure located one above the other
  • Breadth-first search – Traverses the adjacent nodes of a graph before moving outwards

Applications of Data Structures

Data structures are critical for managing data. So, no wonder their extensive list of applications keeps growing virtually every day. Check out some of the most popular applications data structures have nowadays.

Data Organization and Storage

With this application, data structures return to their roots: they’re used to arrange and store data most efficiently.

Database Management Systems

Database management systems are software programs used to define, store, manipulate, and protect data in a single location. These systems have several components, each relying on data structures to handle records to some extent.

Let’s take a library management system as an example. Data structures are used every step of the way, from indexing books (based on the author’s name, the book’s title, genre, etc.) to storing e-books.

File Systems

File systems use specific data structures to represent information, allocate it to the memory, and manage it afterward.

Data Retrieval and Processing

With data structures, data isn’t stored and then forgotten. It can also be retrieved and processed as necessary.

Search Engines

Search engines (Google, Bing, Yahoo, etc.) are arguably the most widely used applications of data structures. Thanks to structures like tries and hash tables, search engines can successfully index web pages and retrieve the information internet users seek.

Data Compression

Data compression aims to accurately represent data using the smallest storage amount possible. But without data structures, there wouldn’t be data compression algorithms.

Data Encryption

Data encryption is crucial for preserving data confidentiality. And do you know what’s crucial for supporting cryptography algorithms? That’s right, data structures. Once the data is encrypted, data structures like hash tables also aid with value key storage.

Problem Solving and Optimization

At their core, data structures are designed for optimizing data and solving specific problems (both simple and complex). Throw their composition into the mix, and you’ll understand why these structures have been embraced by fields that heavily rely on mathematics and algorithms for problem-solving.

Artificial Intelligence

Artificial intelligence (AI) is all about data. For machines to be able to use this data, it must be properly stored and organized. Enter data structures.

Arrays, linked lists, queues, graphs, and stacks are just some structures used to store data for AI purposes.

Machine Learning

Data structures used for machine learning (MI) are pretty similar to other computer science fields, including AI. In machine learning, data structures (both linear and non-linear) are used to solve complex mathematical problems, manipulate data, and implement ML models.

Network Routing

Network routing refers to establishing paths through one or more internet networks. Various routing algorithms are used for this purpose and most heavily rely on data structures to find the best patch for the incoming data packet.

Data Structures: The Backbone of Efficiency

Data structures are critical in our data-driven world. They allow straightforward data representation, access, and manipulation, even in giant databases. For this reason, learning about data structures and algorithms further can open up a world of possibilities for a career in data science and related fields.

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The Educator: OPIT – Open Institute of Technology launches AI agent to support students and staff
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Jul 3, 2025 4 min read

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OPIT – Open Institute of Technology, a global online educational institution, has launched its very own AI agent: OPIT AI Copilot. The institution is amongst the first in Europe to introduce a custom AI assistant for students and faculty.

Developed by an in-house team of faculty, engineers, and researchers, OPIT AI Copilot has been trained on OPIT’s entire educational archive developed over the past three years, including 131 courses, around 3,500 hours of video content, and 320 certified assessments, amongst other content.

Due to this, OPIT AI Copilot can provide responses that adapt in real-time to the student’s progress, offering direct links to referenced sources within the virtual learning environment.

It can also “see” exactly where the student is in their course modules, avoids revealing information from unreleased modules, and provides consistent guidance for a fully integrated learning experience. During exams, it switches to “anti-cheating” mode, detecting the exam period and automatically transitioning from a study assistant to basic research tool, disabling direct answers on exam topics.

The AI assistant operates and interacts 24/7, bridging time zones for a community of 350 students from over 80 countries, many of whom are working professionals. This is crucial for those balancing online study with work and personal commitments.

OPIT AI Copilot also supports faculty and staff by grading assignments and generating educational materials, freeing up resources for teaching. It offers professors and tutors self-assessment tools and feedback rubrics that cut correction time by up to 30%.

OPIT AI Copilot was unveiled during the event “AI Agents and the Future of Higher Education” hosted at Microsoft Italy in Milan, bringing together representatives from some of the world’s most prestigious academic institutions to discuss the impact of AI in education. This featured talks from OPIT Rector Francesco Profumo and founder and director Riccardo Ocleppo, as well as Danielle Barrios O’Neill from Royal College of Art and Francisco Machín from IE University.

Through live demos and panel discussions, the event explored how the technological revolution is redefining study, teaching, and interaction between students, educators, and institutions, opening new possibilities for the future of university education.

“We’re in the midst of a deep transformation, where AI is no longer just a tool: it’s an environment, a context that radically changes how we learn, teach, and create. But we must be cautious: it’s not a shortcut. It’s a cultural, ethical, and pedagogical challenge, and to meet it we need the courage to shift perspectives, rethink traditional models, and build solid bridges between human and artificial intelligence,” says Professor Profumo.

“We want to put technology at the service of higher education. We’re ready to develop solutions not only for our own students, but also to share with other global institutions that are eager to innovate the learning experience, to face a future in education that’s fast approaching,” says Ocleppo.

A mobile app is already scheduled for release this autumn, alongside features for downloading exercises, summaries, and concept maps.

A demonstration of OPIT AI Copilot can be seen here:

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Il Sole 24 Ore: From OPIT, an ‘AI agent’ for students and teachers
OPIT - Open Institute of Technology
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Jul 2, 2025 2 min read

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At its core is a teaching heritage made up of 131 courses, 3,500 hours of video, 1,800 live sessions

The Open Institute of Technology – a global academic institution that offers Bachelor’s and Master’s degrees – launches the “OPIT AI Copilot” which aims to revolutionize, through Artificial Intelligence, the learning and teaching experience. Trained on the entire educational heritage developed in the last three years (131 courses, 3,500 hours of asynchronous videos, 1,800 live sessions per year, etc.) the assistant “sees” the student’s level of progress between the educational modules, avoids anticipations on modules not yet released and accompanies them along the way. In addition to the role of tutor for students, OPIT AI Copilot supports teachers and staff by correcting papers and generating teaching materials, freeing up resources for teaching.
 

Read the full article below:

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