Archaeology is used to study prehistoric societies without written records by examining stone tools and other artifacts dating back 2.5 million years. It sheds light on key developments in human evolution and technological advances. While some literate societies left written records, these are often incomplete or reflect the biases of elite classes. Archaeology provides a more comprehensive understanding of past cultures by studying artifacts that represent a society more broadly, not just the perspectives of the literate minority. The purpose of archaeology is to learn about humanity's development through examining both prehistoric and historic material cultures.