Ghostbusters is a 1984 American comedy film about four men in New York whose job is to catch ghosts — the spirits of dead people — that have come back into buildings. They wear funny jumpsuits, carry made-up packs on their backs, and drive an old car. It is meant to make you laugh more than to truly frighten you, though there are sudden scares. The title is a joke: people who “bust” ghosts, meaning catch them or get rid of them, the way crime-busters catch criminals. English speakers who grew up with it still use the name as a shared joke, and the song line “Who you gonna call?” is widely known. Later films reused the name. Keep the capital G; it is a title, not a common job name, though people do say it in fun when something spooky happens.