The spear is a long stick with a point on the top, like a javelin, which is often thrusted or stabbed at people instead of launched/thrown. The point is either the sharpened end of the stick or there is a pointed (and often bladed) metal head attached to the stick. It was a very common weapon used by both nobility and the common soldiery, both on foot or whilst mounted.
A long spear designed to be wielded soley in the hand from horseback is called a lance.
One legend of the Battle of Stamford Bridge is of the berserker who, armed with a daneaxe, held the bridge alone, and was only killed when an English solider floated under the bridge in a salting tub and speared him through the planks of the bridge itself. This legend is the origin of the Spear Pie, a Yorkshire pastry shaped like a boat.