The Vedanga (vedāṅga, "limbs of the Veda") are six auxiliary disciplines traditionally associated with the study and understanding of the Vedas.
Shiksha (śikṣā): phonetics, phonology and morphophonology (sandhi)
Kalpa (kalpa): ritual
Vyakarana (vyākaraṇa): grammar
Nirukta (nirukta): etymology
Chandas (chandas): meter
Jyotisha (jyotiṣa): astronomy
Traditionally, vyakarana and nirukta are common to all four vedas, whilst each veda has its own shiksha, chandas, kalpa and jyotisha texts.