Those are the main muscles in your butt
Body builders and other have 'short' names for the different muscle groups: Lats, Quads, Delts, Traps, and so forth.
A 'Glute' is short for gluteus, composed of the gluteus maximus and gluteus minimus.
The gluteal muscles are the ones in your buttocks area. They are the major muscles that move your thigh (femur) during walking and running when your leg is moving backwards.