An Unidentified Flying Object (UFO) refers to any aerial phenomenon that cannot be immediately identified. This term is often associated with sightings of strange objects in the sky, which may include anything from weather balloons to experimental aircraft. The key aspect of a UFO is that it remains unexplained at the time of observation. UFOs have been a subject of fascination and speculation, leading to various theories about extraterrestrial life and advanced technology. While many sightings can eventually be attributed to known objects or natural occurrences, some remain unexplained, fueling ongoing interest in the topic and prompting investigations by organizations like the U.S. government and private researchers.