A ghost is an incorporeal spirit of a dead person. Their abilities range considerably depending on the game system. Ghosts, like many undead creatures, usually linger because they desire the fulfillment of something, such as a task which they failed to finish.

In some settings (such as the World of Darkness), Ghosts. Spectres, and Wraiths are all variants of the same thing.

Subraces and Variants

Corpse CandleRavenloft
Mirror-Mad PhantasmInnistrad
Moaning SpiritDominia
Spell QuellerInnistrad