Mindstream (Pali: citta-santāna, Sanskrit: citta-saṃtāna, Tibetan: sems-rgyud, Ch: xin xiangxu 心相續) in Buddhist philosophy is the moment-to-moment continuum of sense impressions and mental phenomena (citta), which is also described as continuing from one life to another. Often described as a "stream of mind" or "mental continuum," the mindstream is not a static entity but a dynamic flow of arising and passing mental phenomena, which refers as a string of passing moments that happen either in the same lifetime or in the transitional period between one life and another.