Macros are abbreviations for lengthy and frequently used statements. When a macro is called the entire code is substituted by a single line through the macro definition is of several lines.
The advantage of macro is that it reduces the time taken for control transfer as in the case of function. The disadvantage of it is here the entire code is substituted so the program becomes lengthy if a macro is called several times.
First read the answer fully, then try to explain it in your own words. After that, open a few related questions and compare the concepts. This method helps you remember the topic for a longer time and improves exam preparation.