Parameter: In computer programming, a special kind of variable, is used in a subroutine to refer to one of the pieces of data provided as input to the subroutine.[b] These pieces of data are the values of the arguments (often called actual arguments or actual parameters) with which the subroutine is going to be called/invoked. An ordered list of parameters is usually included in the definition of a subroutine, so that, each time the subroutine is called, its arguments for that call are evaluated, and the resulting values can be assigned to the corresponding parameters.