Homo erectus: An early human species that emerged around 1.9 million years ago and is considered the first human species to have spread out of Africa and across much of Eurasia. Homo erectus is closely associated with the development of the Acheulean stone tool technology.
Handaxe: A large, bifacially flaked stone tool that is a hallmark of the Acheulean tool tradition. Handaxes were versatile tools used for cutting, chopping, and other tasks, and their production required advanced stone tool making skills.
Oldowan: An earlier stone tool tradition that preceded the Acheulean and was characterized by simpler, more basic stone tools. The Acheulean emerged from the Oldowan tradition and represents a significant technological and cultural advancement in early human evolution.