Which Are Abstract Data Type?


Angela Bailey

An abstract data type (ADT) is a concept in computer science that refers to a high-level description of a data structure along with the operations that can be performed on it. It provides an abstraction layer, allowing programmers to work with data structures independently of their implementation details. In this article, we will explore some commonly used abstract data types and their characteristics.


A stack is an ADT that follows the Last-In-First-Out (LIFO) principle. It can be visualized as a stack of plates, where the last plate added is the first one to be removed. A stack supports two main operations: push (to add an element to the top) and pop (to remove the top element).

  • Push: Adds an element to the top of the stack.
  • Pop: Removes and returns the top element from the stack.


A queue is an ADT that follows the First-In-First-Out (FIFO) principle. It can be visualized as a line of people waiting for a bus, where the person who arrived first gets on the bus first. A queue supports two main operations: enqueue (to add an element to the end) and dequeue (to remove an element from the front).

  • Enqueue: Adds an element to the end of the queue.
  • Dequeue: Removes and returns an element from the front of the queue.


Trees are hierarchical data structures that consist of nodes connected by edges. Each node can have zero or more child nodes, except for the root node, which has no parent. Trees are widely used in various applications such as file systems and hierarchical database structures.

Binary Trees

A binary tree is a tree data structure where each node has at most two child nodes: left and right. Binary trees are commonly used for efficient searching and sorting algorithms such as binary search.

Binary Search Trees

A binary search tree (BST) is a type of binary tree with an additional property: for any given node, the value of all nodes in its left subtree is less than its value, and the value of all nodes in its right subtree is greater than its value. This property enables efficient searching, insertion, and deletion operations.


A graph is a collection of nodes (vertices) connected by edges. Graphs can be used to represent relationships between objects or entities in various domains such as social networks, transportation networks, and computer networks.

  • Vertices: Nodes in a graph.
  • Edges: Connections between vertices.


Abstract data types provide a way to organize and manipulate data in a structured manner. Stacks, queues, trees, and graphs are just some examples of commonly used abstract data types. By understanding their characteristics and operations, you can choose the appropriate data structure for your specific needs.

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