A stack represents a sequence of objects in a linear data structure format.
The stack consists of a bound floor and all operations are performed on the upper floor. Whenever an element is added to a stack with a push function, the top value is increased by one, and when the element exits the stack, the top value is reduced by another. The pointer at the top of the stack is also known as the stack pointer.

It follows the LIFO (Last In First Out) or FILO (First In Last Out)principle. The element inserted last in the stack will be popped out first. All the operations will perform from only one direction. Or you can say that stack is said to be a pipe with only one opening.

The stack can be adjusted in size or have flexible use when size is allowed to change. In the case of stacked volume stacks, attempting to add a feature to already packed stack results in a different stack overflow. Similarly, a situation where a pop activity attempts to remove an element from an already empty stack is known as an underflow.

Stack is considered a limited data structure having a limited number of functions. In addition to push and pop functionality, some implementations may allow for advanced functions such as:

  • See - View item at the top of the stack.
  • Duplicate - Copy the value of the item to the variable and return it to the stack.
  • Swap - Swap for the top two items in the stack.
  • Rotate - Move the highest features in the stack as mentioned by number or move in a circular motion.