Anapanasati
Ānāpānasati (Pali; Sanskrit: ānāpānasmṛti), meaning "mindfulness of breathing" (sati means mindfulness; ānāpāna refers to inhalation and exhalation), is the act of paying attention to the breath. It is the quintessential form of Buddhist meditation, attributed to Gautama Buddha, and described in several suttas, most notably the Ānāpānasati Sutta (MN 118).