There are six Vedangas (limbs of Veda).
They are: Siksha, Kalpa, vyakarana, niruktas, chhandas and jyotisa.
Siksha deals with pronunciation,
Kalpa with rituals,
Vyakarana with grammar,
Nirukta with etymology,
Chhanda with meter and Jyotisa with astrosciences.
The Vedangas are first mentioned in the Mundaka Upanishad . Later on they developed into indepenpdent disciplines.