Mudra (Sanskrit: मुद्रा) literally means "seal", "brand" or "gesture", it is a symbolic gesture used in Tantric rituals of both Hindu and Buddhist tradition. The mudras can be performed with the whole body but most are performed with the hands. Mudras are part of a system that uses the body to express and emphasize the intentions of the mind. Are often used in yoga practice in association with breathing (pranayama), in meditation and for healing purposes. Stimulate different parts of the body and affect the flow of prana, the vital energy.
source: