Aliens are said to be humanoids representing life which does not originate from the Earth or the living objects belonging to extraterrestrial life.
The popular public impressions about the looks of aliens are the ones ingrained by American science-fiction comics and films. Even UFO digital cinema is popular on the Internet leading kids to believe in the existence of aliens.
Unidentified flying objects (UFOs) and aliens seem to be related in the public mind due to the reports about their sighting. The UFOs were earlier called "flying saucers", but in 1950s the term UFO became more widespread and accepted. In the science fiction films, spaceships of aliens are shown like flying saucers.