Read across the specific figures gathered elsewhere under this generic entry, a small number of recurring structural patterns emerge regardless of the culture of origin. A ghost is very often the product of a death that went wrong in a specific, nameable way, violent, sudden, unmourned, unmarried, or improperly buried, rather than an arbitrary supernatural intrusion, which is why funerary ritual across cultures as different as Chinese ancestor veneration, Roman Parentalia and Hindu shraddha offerings is so consistently framed as the primary defence against a troubled afterlife.
A second pattern is that the remedy for a dangerous ghost is usually not combat but correction: settling a debt, completing a rite, or naming and honouring a grievance, which places the ghost figure closer to unfinished business made visible than to a monster in the modern horror sense. Comparative religious scholarship, including the broad synthesis found in the Encyclopedia of Religion, treats the ghost as one of the clearest windows available into how a given culture actually thinks death should be handled, since what a society fears in its dead reveals what it expects of the living toward them.