When you compile a program the compiler first uses a preprocessor to analyze the code. The #define directive can be used to either define a constant number or function or to replace an instruction in your code.
For instance:
#define for_ever_do while(1)
This means you can use for_ever_do instead of while(1) and the effect will be the same because the preprocessor first replaces for_ever_do with while(1) and then the program is compiled. With #define you can also create function or more precisely called, a macro.
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