Assembler directives:
An assembler directive is a statement to give direction to the assembler to perform the task of assembly process. Assembler directives control organization of the program and provide essential information to the assembler to understand assembly language programs to produce machine codes. They signify how an operand or section of a program is to be processed by assembler. An assembler supports directives to define data, to organize segments to control procedures, to define macros etc.