Final answer:
Programs need a memory stack area to store local variables and function calls.
Step-by-step explanation:
Programs need a memory stack area because it is used to store local variables and function calls during program execution.
The stack is a region of memory that grows and shrinks dynamically as functions are called and return.
When a function is called, the memory for local variables and function parameters is allocated on the stack, and when the function returns, that memory is deallocated.