Tires on vehicles should be rotated every 6,000 to 8,000 miles or every 6 months whichever comes first.
The rotating of tires is done to help the tires wear evenly as well as making the vehicles tires last longer.
When your tires are rotated the front wheel is moved to the back and the back wheel is moved the front of the vehicle on each side of the vehicle.
Rotating tires is not a requirement however if you want the tires to last longer on the vehicle rotating the tires can help the tires last longer and wear better.
Your front tires wear a lot faster than your vehicles rear tires because as you make turns there is more pressure on the outer edges of the front tires.