Just as in conventional life on Earth, there are a range of "afterlife" experiences.
Basically, there are six possible realms, three lower realms and three higher realms. The lower realms are the hell realm, the hungry ghost realm and the animal realm. The higher realms are the human realm, the jealous god realm and the god realm. All of these realms are subject to karma and rebirth in any of the other realms.
Nirvana, though, is not a realm, as such, but an unconditioned spiritual state that is beyond the six realms. One is no longer subject to karma. One has gone beyond karma. This is an inexpressible state which must be realized within oneself to be understood. This is our natural state of awareness once we have realized our original nature.