technoguy

In computer science, a subroutine (function, method, procedure, or subprogram) is a portion of code within a larger program, which performs a specific task and is relatively independent of the remaining code.A subroutine is often coded so that it can be executed ("called") several times and/or from several places during a single execution of the program, possibly even by itself. Mainly because of this feature, subroutines are a powerful programming tool. Judicious use of subroutines (for example, through the structured programming approach) will often subtantially reduce the size and cost of a program, while improving its readability and reliability. Subroutines, often collected into libraries, are an important mechanism for sharing and reusing code.

savvytechno

In short, an independent program segment separate from the main program that performs a specific task. Subroutines are called from the main program with the GOSUB statement and must end with a RETURN statement.