Final answer:
A lance is a type of weapon specifically designed as a cavalry version of the spear, used for thrusting, with a long reach effective in mounted combat and warfare.
Step-by-step explanation:
A lance is a kind of weapon. It is a cavalry version of the piercing spear, which was used extensively in warfare. The spear itself is one of the oldest weapons used by humans, both for hunting and combat. With the advancement of metallurgy, spears evolved to have metal shafts and spearheads. The lance, specifically designed for use by cavalry, was a long weapon that could be used for thrusting and provided the benefit of a longer reach in combat, especially effective during charges.
The significant difference between other spears and a lance lies in the design for mounted combat, where lances were particularly effective. They were essential weapons during medieval times and were often seen in tournaments such as jousting as well as on the battlefield.