Taijutsu is a basic form of techniques and those are techniques that refer to techniques that relay on one's physical and mental energy,strengh and stamina gained through training.Taijutsu techniques usualy don't require chakra to be performed altough chakra can be used to enhance the technique.Also it usually doesn't require hand seals but it sometimes require some stances and poses making taijutsu qickeer to perform than ninjutsu and genjutsu.Simpler-Taijutsu is hand to hand combat.
Almost all ninja use taijutsu tho some are specialising in taijutsu and use unique techniques.For example the Hyuuga clans gentle fist requires the use of chakra and it needs great skill in controling it.Taijutsu is usually used to execute an atack quick and save chakra.Taijutsu can be used in coloboration with ninjutsu to form nintaijutsu techniques.
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