typedef

A nickname for a type

typedef doesn't create a new type — it gives an existing one an alias, most often used to drop the repetitive struct keyword.

Before and after

Now Point alone works as a type name, no struct prefix needed.

typedef struct {
    int x;
    int y;
} Point;

int main(void) {
    Point p = {1, 2};
    printf("%d,%d\n", p.x, p.y);
    return 0;
}

Output:

1,2