GRE Subject Tests

Computer Science explores the principles and applications of computing, programming, and information technology.

What is Computing?Programming BasicsInformation Technology in Daily Life
Algorithms and Problem-SolvingData StructuresCybersecurity and Privacy
Building Your First ProgramCollaborative Projects and TeamworkSolving Real-World Problems With Code
Breaking Problems Into StepsPracticing With Mini-Projects
What is Computing?Programming BasicsInformation Technolo...Algorithms and Probl...Data StructuresCybersecurity and Pr...Building Your First ...Collaborative Projec...Solving Real-World P...Breaking Problems In...Practicing With Mini...
Advanced Topics

Data Structures

Organizing Data With Data Structures

Data structures are special ways of organizing and storing data so computers can use it efficiently. Each type of data structure is good for different kinds of jobs.

Common Data Structures

  • Array: Like a list of numbered boxes, great for storing items in order.
  • Linked List: A chain of items connected one after another.
  • Tree: Like a family tree, perfect for organizing related information.

Why Data Structures Matter

Choosing the right data structure makes programs faster and more efficient.

Everyday Examples

  • Contact lists on your phone use arrays.
  • File systems on computers use trees to organize folders and files.

Examples

  • Using a tree structure to organize folders on a computer.

  • Storing high scores in a game with an array.

In a Nutshell

Data structures help computers store and find information quickly and easily.

Key Terms

Array
A data structure that stores items in a fixed order.
Linked List
A data structure where each item points to the next one.
Tree
A branching data structure, used to organize information hierarchically.
Next
Cybersecurity and Privacy