Does C have booleans?

In C99, we have the header stdbool.h. The important contents are:

#define bool _Bool
#define true 1
#define false 0

The true and false are simple, but what is this _Bool? It’s a reserved keyword, and a type much like int, etc.

I wrote this because I felt like it. This post is my own, and not associated with my employer.

Jim. Friends. Vidrio.