A spear is a weapon used in Antiquity and the Middle Ages. It is meant to primarily stab. Some spears can also slash. Some kinds of lightweightspears were also meant to be thrown.
A lance is a special spear used from horseback. Knights often used it during medieval times. A pike is a very big spear for infantry to fight horsemen.
Pila (one pilum, several pila) were spears used by Roman armies
Arrowheads and spearheads as they were common in antiquity
Fishing with a spear, in Peru