A procedure is a compilation of instructions to which we can express the flow of our program, and once the execution of these instructions is over power is given back to the next line to process of the code which identified on the procedure.
Procedures aid us to generate legible and simple to modify programs.
At the time of calling up a procedure the address of the after that instruction of the program is kept on the stack so that, one time the flow of the program has been transported and the procedure is done, one can go back to the next line
of the original program, the one which identified the procedure.