Why use function prototypes?

Question

Why use function prototypes in C? It seems sort of redundant because we already declare the function name, argument types, and return type in the definition. Do the prototypes h

Answer 1

While a function definition specifies what a function does, a function prototype can be thought of as specifying its interface.

Creating library interfaces: By placing function prototypes in a header file, one can specify an interface for a library.