Which Is Abstract Data Type?


Heather Bennett

An abstract data type (ADT) is a theoretical concept in computer science that defines a data structure along with the operations that can be performed on it, without specifying how the data structure is implemented. In other words, an ADT focuses on what the data structure does, rather than how it does it.

Characteristics of an Abstract Data Type

ADTs have several key characteristics:

  • Encapsulation: ADTs encapsulate both the data and the operations that can be performed on that data. This allows for better organization and separation of concerns within a program.
  • Data Abstraction: ADTs provide a level of abstraction by hiding the implementation details of the data structure.

    This allows users to interact with the ADT using only its defined operations, without needing to know how those operations are implemented.

  • Modularity: ADTs promote modularity by providing a clear interface for interacting with the data structure. This makes it easier to update or replace the implementation of an ADT without affecting other parts of a program.

Examples of Abstract Data Types

There are several commonly used abstract data types in computer science:


A stack is a type of collection where elements are added and removed from one end called the “top”. The last element added to the stack is always the first one to be removed (last-in, first-out). Common stack operations include push (add element to top) and pop (remove element from top).


A queue is another type of collection where elements are added at one end called the “rear” and removed from another end called the “front”. The first element added to the queue is always the first one to be removed (first-in, first-out). Common queue operations include enqueue (add element to rear) and dequeue (remove element from front).


A linked list is a linear data structure where elements are stored in nodes that contain both the data and a reference to the next node. Each node is connected to the next node in the list, forming a sequence. Linked lists allow for efficient insertion and deletion of elements at any position in the list.


Abstract data types provide a way to organize and manipulate data in software development. By focusing on what a data structure does rather than how it does it, ADTs promote modularity, encapsulation, and data abstraction. Understanding different abstract data types can help programmers choose the most appropriate data structure for their specific needs.

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