What's different about the sumo squat is that your stance is much wider and your feet are pointed out. This movement will have more emphasis on your glutes and adductors (the inner thigh area).
1) Stand with your feet wide and toes pointed out.
2) Hold one or two dumbbells (your choice) directly in front of your body.
3) Lower yourself into the wide squat. Make sure to keep your spine stable and chest upright. Drive through heels as you com back up to starting position.
If you have any additional tips for this exercise, please let me know in the comments below and I will add them to this card. :)