Jump (ジャンプ) is one of the basic movements used in all Tekken games and fighting games in general.
It can be accomplished by inputting up-left, up or up-right directions. In the original Tekken and Tekken 2, characters could jump unrealistically high. As of Tekken 3, jumping was made more realistic. A jump can be used to avoid an unblockable attack in earlier Tekken games and avoid low attacks. An opponent can perform an airborne throw on a player during a jump because they are considered airborne.
There are also many moves that give a "jump" or "airborne" status. It can also be used to dodge certain moves, if timed right.