C preprocessor

The C preprocessor is a tool that runs before the actual compilation of C code. It processes special instructions called directives, like `#include` to add code from other files or `#define` to create shortcuts for commands. Essentially, it prepares and modifies your code, making it easier to manage and reuse, before the main compiler turns it into a program. Think of it as a helper that sets up and simplifies code, ensuring everything is in the right place for smooth compilation.