What is a flying saucer?

Many people have reported seeing unidentified flying objects, also known as UFOs, in the sky. Some of them described these objects in the shape of discs or saucers hovering overhead with a glow around them. These have been mostly interpreted as transport vehicles of aliens visiting earth, but photographs of them are now believed to be hoaxes. The first highly publicized sighting by Kenneth Arnold on June 24, 1947, resulted in the creation of the term by US newspapers.