High Quality Content by WIKIPEDIA articles! In computer science, a call stack is a stack data structure that stores information about the active subroutines of a computer program. This kind of stack is also known as an execution stack, control stack, function stack, or run-time stack, and is often shortened to just "the stack". Although maintenance of the call stack is important for the proper functioning of most software, the details are normally transparent in high-level programming languages. A call stack is used for several related purposes, but the main reason for having one is to keep track of the point to which each active subroutine should return control when it finishes executing. (The active subroutines are those which have been called but have not yet completed execution by returning.) If, for example, a subroutine DrawSquare calls a subroutine DrawLine from four different places, the code of DrawLine must have a way of knowing where to return. This is typically done by code for each call within DrawSquare putting the address of the instruction after the particular call statement (the "return address") onto the call stack.

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