Filming is using a camera to record a story or real events, so people can watch them later — in a cinema, on television, or on a phone. You can use it as a verb: they are filming in the park. You can also use it as a name for the work: filming starts on Monday. It covers made-up stories and films about real life, news, a wedding, a short clip. On a movie set, “We’re filming” means the camera is working now, so be quiet. Though actually, the word does not care how big the camera is. A student filming a skit on a phone is still filming. For a big movie, people also say shooting, which sounds more like the industry. Filming is the clear, ordinary word. A film is the finished thing you watch; filming is the doing.