Ghosts are commonly believed to be victims of accidents or murder and remain in the places they were killed, haunting those locations until they resolve whatever business keeps them bound to the mortal world. In many cases, a ghost may not even remember what business it has to complete and is forced to haunt its place of death forever. Ghosts cannot normally interact with the material world; they cannot be seen, heard and cannot touch anything. However, people with strong psychic ability may be able to sense the presence of ghosts and similar apparitions, and may be able to tap into this latent power and communicate with a ghost on some level. Some types of electronic equipment can detect ghosts as well, though usually the presence of ghosts interferes with the functions of machines. Certain animals (especially cats and dogs) are also said to be able to sense a ghost's presence.
Ghosts are often thought to appear as they did in life, though their ghostly form may appear transparent or deathly white. Some accounts of ghosts describe the spirits appearing fully material, but they appear to bare whatever injuries resulted in their deaths (eg. a ghost who had been killed by decapitation might have a scar on its neck or may even hold its head in its hands). Less serious depictions of ghosts in modern media describe them as appearing to be draped in white sheets and hang in the air.