Tire Rotation is the physical relocation of tires to different positions in an effort to maximize the tread life on a set of tires. Front wheels generally wear out more quickly than rear wheels, so rotating tires from the front to the back (and vice versa) allows tires - regardless of position - to wear at a similar rate.
Front Wheel Drive (FWD) and Rear Wheel Drive (RWD) vehicles have different rotation recommendations, so consult a tire professional for guidance.
Experts suggest that tires are rotated every 5,000 - 8000 miles for the life of the tires. Check with your tire professional to see what works best for your situation.