A hominid refers to a member of the biological family Hominidae, which includes modern humans, their ancestors, and other primates such as gorillas, chimpanzees, and orangutans. Hominids are characterized by specific evolutionary traits, including larger brains and the ability to walk upright. The study of hominids is crucial for understanding human evolution and the development of complex behaviors, tool usage, and social structures. The fossil record of hominids provides insights into our evolutionary history, highlighting the adaptations that have occurred over millions of years.