Hominid evolution refers to the biological and evolutionary process that led to the development of modern humans, known as Homo sapiens. This process began millions of years ago with early ancestors, such as Australopithecus, who walked on two legs and exhibited both ape-like and human-like traits. Over time, various species emerged, adapting to changing environments and developing unique characteristics. Key milestones in hominid evolution include the use of tools, the development of language, and increased brain size. Notable species in this lineage include Homo habilis, known for its tool-making abilities, and Homo erectus, which showed advanced social behaviors. These evolutionary changes ultimately paved the way for the emergence of modern humans.