A hammerstone is a type of tool used in prehistoric times, primarily made of hard rock. It is typically a rounded or oval-shaped stone that early humans used to strike other stones, such as flint, to create sharp edges for cutting tools. This technique is known as knapping and was essential for making tools for hunting and gathering. Hammerstones are significant in archaeology as they provide insight into the tool-making practices of early humans. They are often found at ancient sites alongside other artifacts, such as flint tools and choppers, helping researchers understand the technological advancements of our ancestors.