Simply put, it is the realization of "conditional causation and the immateriality of the nature of all things." Buddhism holds that everything derives from brief conjunctions of primary causes; once the primary cause disappears, everything returns to an immaterial state.
簡單說來，「般若」相當於「緣起性空」﹘﹘佛教認為，短暫的因緣和合，造就了萬事萬物；因緣一旦散去，一切又復歸空寂。