Definition of the macro
A macro is a collection of repetitive instructions in a program which are codified only one time and can be used as many times as required. The major difference between a macro and a procedure is that in the macro the passage of parameters is possible and in the process it is not, this is only applicable for the TASM - there are some other programming languages which do allow it. At the instant the macro is executed each parameter is alternated by the name or value individual at the time of the call.
We can say then that a procedure is an addition of a determined program, while the macro is a module with particular functions which can be used by different programs. One more difference between a macro and a procedure is the method of calling each one, to call a procedure the use of a directive is required, conversely the call of macros is done as if it were an assembler instruction.