The Acheulean is a prehistoric stone tool industry that emerged around 1.76 million years ago and lasted until about 100,000 years ago. It is characterized by large bifacial hand axes and other tools made from flint and other stones. The tools were primarily used by early human species, including Homo erectus and Homo heidelbergensis, for various tasks such as cutting, digging, and butchering. Acheulean tools are significant for their advanced design compared to earlier tool-making traditions. The distinctive teardrop shape of the hand axes reflects a high level of skill and planning. This tool industry marks an important stage in human evolution, showcasing the cognitive and motor abilities of early humans.