범어 bhava의 번역으로, 유정 (有情)으로서의 존재 또는 생존을 뜻하며, 공 (空)과 무 (無)의 반대 개념. 유 (有)에는 실재론적 실유 (實有), 연기론 (緣起論)적 가유 (假有), 유식 (唯識)에서 말하는 진공묘유 (眞空妙有)의 세 가지가 있다. 이것 이외에도 여러 가지로 분류되며, 그중 하나를 예로 든다면, 삼유 (三有)로, 이는 삼계 (三界)의 욕유 (欲有), 색유 (色有), 무색유 (無色有)를 뜻함. (유위법 (有爲法) 참조)

Bhava, or existence: Lit. "there is," an antithesis to non-being, "there is not." There is nothing that is more anxious and worrisome than to exist. Hence Nirvana is to be free from all the anxieties of life. There are three different beings or existences:
1) True existence: Every kind of being in the three spheres (being in the realm of desire, being in the realm of non-desire, and being in the formless spiritual realm).
2) Provisional existence: Every being as deceptive, conditioned or phenomenal, not real.
3) Ultimate existence: Every being as neither existent nor non-existent, which is called "the wondrous being of true emptiness." Cf. (Yuwi(beop) All compounded things.