What is "anapanasati"

Ānāpānasati ( Pali; Sanskrit ānāpānasmṛti), meaning " mindfulness of breathing" ("sati" means mindfulness; "ānāpāna" refers to inhalation and exhalation), is a form of Buddhist meditation now common to Tibetan, Zen, Tiantai and Theravada Buddhism as well as Western-based mindfulness programs. Anapanasati means to feel the sensations caused by the movements of the breath in the body as is practiced in the context of mindfulness. According to tradition, Anapanasati was originally taught by Gautama Buddha in several suttas including the Ānāpānasati Sutta. (MN 118)