#define NAME "THING_ITS_REPLACED BY"

#define will, when the code is compiled, replace any mention of name with anything proceeding it.

`#define` is low key crazy

#define TOES = 1024;
 
void main()
{
	int test;
	// This is actually real. This is a thing you can do. This is crazy
	test TOES
	printf("%d", test);
}

In this case, TOES is equal to “= 1024;” literally. The line test toes is actually just test = 1024;
So not only can you declare some constant values. You can essentially store lines of code with #define with no regulations at all.

Unlike variables, define dies NOT take extra memory! That can be useful for cases where you have a constant like $\pi$ that you use everywhere

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