Stack (abstract data type)

What is a stack?

In computer science, a stack is an ADT that serves as a collection of elements, with two main operations:

Push, which adds an element to the collection, and

Pop, which removes the most recently added element that was not yet removed.
— Wikipedia

Example of stack of layers:

       ____________ precedence
      / LIFO      / | high
  31 /___________// |
  30 /___________// |
  29 /___________/  |
   :   _:_:_:_:_:__ |
   :  / : : : : : / |
   2 /___________// |
   1 /___________// |
   0 /_FILO______/  V low

References

Stacks - Coursera