Let's get familiar with UFOs!
The term UFO (Unidentified Flying Object) came about in the 1950s. Earlier, in 1947, the public began referring to unusual objects in the sky as flying saucers, or discs. Today, UAP (Unidentified Aerial Phenomena) is the preferred term used by the U.S. Government. OVNI is the acronym for UFOs in Spanish, French, Italian, and Portuguese-speaking regions around the world.
Thousands of UFOs are reported each year. In North America, most reports are made through MUFON and the National UFO Reporting Center (U.S. organizations). GEIPAN, a unit of the French Space Agency, collects and reports UFO data as well. In the Southern Hemisphere, the Brazilian and Chilean Governments have been open about their OVNI investigations for decades. Around the world, many UFO enthusiasts and groups are attempting to track UFOs on their own to help bring transparency to the subject.
What are these things?!
That's the question people have been asking for decades. Most UFOs are unremarkable and can be easily explained, but some reports of unidentified flying objects are difficult to comprehend given our current understanding of science and technology.
Skeptics suggest that the more unusual sightings are of experimental craft, or top secret projects that the public hasn't been made aware of yet. Many UFO researchers, on the other hand, argue that these sorts of explanations can't account for everything.