There are the worlds of hell, hungry spirits, animals, Asura, humans and heaven, as well as the worlds of voice-hearers, cause-awakened ones, Bosatsu and the spiritual realm of Buddhahood, all of which are collectively called Jikkai.
地獄(仏教)界・餓鬼界・畜生界・阿修羅界・人界・天界・声聞界・縁覚界・菩薩界・仏界に分類され、これらの総称が十界である。