Atvs are for trail riding or racing and will usually have more speed available, as well as bright colors for high visibility on the trails.
The automatic clutch is another feature that might cause some confusion. An automatic clutch requires putting the ATV into the appropriate gear when the engine hits the corresponding RPM for that gear. An automatic clutch does not mean an automatic transmission. Models with an automatic clutch will not have a foot peg for shifting instead, there is a shifter for your left thumb on the handlebar. An ATV with automatic transmission has its drawbacks as well, as in order to have the machine engage the auto transmission, the driver must maintain a certain number of RPMs. This can be a problem when climbing steep, rocky terrain.