UFO sightings refer to reports of unidentified flying objects observed in the sky. These sightings can involve various shapes, sizes, and behaviors that do not match known aircraft or natural phenomena. Many people have claimed to see these objects, leading to public interest and speculation about their origins. The term "UFO" does not imply that these objects are extraterrestrial in nature; it simply means they have not been identified. Investigations by organizations like the U.S. government and various scientific communities aim to understand these phenomena better and determine whether they have conventional explanations.