Unidentified Flying Object or UFO is a term that has been in use since the 1950s. However, due to the recent advancements in technology and science, many people feel that the term has become obsolete. There are now many other terms that can be used in place of UFO. Some of these include Alien Craft, Unidentified Aerial Phenomena (UAP), Unknown Flying Object (UFO), and Anomalous Aerial Vehicle (AAV). While all of these terms refer to the same thing, they help to remove the stigma that surrounds the term "UFO" and provide a more scientific and objective way of referring to sightings of unidentified flying objects in the sky.