Prehistoria.

An arrowhead is sharp and is attached to an arrow to hunt when needed, have more facilities. Normally stone were moved forward by other materials were used. This art is very important in the evolution of humans.
In prehistoric times it was used to hunt animals. It was his only weapon along with other types of stones specially created; scraping skins, killing animals, etc..
Thanks to this invention evolved can hunt animals, catch fish, etc..
All were miss a material called "flint".