Lets say you have two functions. Function A and function B. Function A does a bunch of stuff and function B is executed in the middle of function A. Well when f

Lets say you have two functions. Function A and function B. Function A does a bunch of stuff and function B is executed in the middle of function A. Well when function B returns the program must remember the context of function A in order to execute the remaining steps. It does this by storing the entire context of function A on a stack. This is known as the 'call stack.' Essentially, all recursive functions can and usually are implemented using a stack.