What Is a Queue and Stack?

Stack is a container of objects that are inserted and removed according to the last-in first-out (LIFO) principle. Queue is a container of objects (a linear collection) that are inserted and removed according to the first-in first-out (FIFO) principle.

What is queue and example?

It is also known as “first-come first-served.” The simplest example of a queue is the typical line that we all participate in from time to time. We wait in a line for a movie, we wait in the check-out line at a grocery store, and we wait in the cafeteria line (so that we can pop the tray stack).

What is stack and queue where is it used?

Stacks are used in cache based applications, like recently opened/used application will comes up. Queues are used in deleting/remove the data, like first inserted data needs to be deleted at first.