"Grays" refer to a type of extraterrestrial being often depicted in popular culture and UFO lore. They are typically described as having small bodies, large heads, and big black eyes. These characteristics have made them a common subject in science fiction and conspiracy theories about UFOs and alien encounters. The concept of grays gained prominence in the 20th century, particularly after reports of alleged abductions. Many people claim to have seen or interacted with these beings, leading to various interpretations and theories about their origins and intentions. Despite their popularity, there is no scientific evidence supporting the existence of grays or any other extraterrestrial life forms.