Ufology is the investigation of unidentified flying objects (UFOs) by people who believe that they may be of extraordinary origins (most famously, extraterrestrial alien visitors). While there are instances of government, private, and fringe science investigations of UFOs, ufology is regarded by skeptics and science educators as a canonical example of pseudoscience.
An unidentified flying object (UFO) is any aerial phenomenon that cannot immediately be identified or explained. The term “UFO” (or “UFOB”) was coined in 1953 by the United States Air Force (USAF) to serve as a catch-all for all such reports. In its initial definition, the USAF stated that a “UFOB” was “any airborne object which by performance, aerodynamic characteristics, or unusual features, does not conform to any presently known aircraft or missile type, or which cannot be positively identified as a familiar object”.
During the late 1940s and through the 1950s, UFOs were often referred to popularly as “flying saucers” or “flying discs”. The term UFO became more widespread during the 1950s, at first in technical literature, but later in popular use. UFOs garnered considerable interest during the Cold War, an era associated with a heightened concern for national security, and, more recently, in the 2010s, for unexplained reasons.