Shatkarma (Sanskrit: षटकर्मन ṣaṭkarman), also known as Shatkriya, refers to the Yogic practices involving purification of the body.
Shatkarma is a compound word consisting of two components: shat meaning ‘six’ and karma meaning ‘art’ or ‘process’. The word kriya or karma is used in Hatha Yoga in a special technical sense regarding the techniques of cleaning. These practices, outlined by Yogi Swatmarama in the Hatha Yoga Pradipika, are:
Netī, nasal cleaning.
Dhautī, cleaning of the digestive tract.
Naulī, abdominal massage.
Basti, colon cleaning.
Kapālabhātī, purification and vitalisation of the frontal lobes.
Trāṭaka, blinkless gazing.
Definition courtesy Wikipedia.