Sometimes data structures are used to organize important data (for example, a collection of names and associated phone numbers), and sometimes data structures are used for book-keeping as an algorithm runs. We'll look at stacks, queues, and linked lists.

Which data structure is most used?

Arrays. An array is the simplest and most widely used data structure. Other data structures like stacks and queues are derived from arrays.

In which field data structure is used?

Data Structures are widely used in almost every aspect of Computer Science i.e. Operating System, Compiler Design, Artifical intelligence, Graphics and many more. Data Structures are the main part of many computer science algorithms as they enable the programmers to handle the data in an efficient way.