An off-road vehicle is considered to be any type of vehicle which is capable of driving on and off paved or gravel surface. It is generally characterized by having large tires with deep, open treads, a flexible suspension, or even caterpillar tracks.
Several types of motor sports involve racing off-road vehicles. The three largest "4-wheel vehicle" off-road types of competitions are rally, desert racing, and rock crawling. The three largest types of all-terrain vehicle (ATV) / motorcycle competitions are Motocross, Enduro, and also desert racing like Dakar Rallye and Baja 1000.