Mounts are used for riding and are obtained through taming.
Getting a MountEdit
To get a mount, you need taming skill of at least 40. You then have to find horse spawns (Horses are the only mount so far) and tame one.
Riding your MountEdit
To ride your mount, make sure you have the riding skill then press 'R' while beside your mount. The higher your riding is, the less you will fall. You still have to feed your pet to increase it's loyalty.