Assigning char array a value in C

What is the difference between:

char fast_car[15]="Bugatti";

and

char fast_car[15];
fast_car="Bugatti";

Because the second one results with compile error:

error: incompatible types when assigning to type ‘char[15]’ from type ‘char *’

While the first one works fine. Putting a string in array in different place than array initialisation would be helpful.