For tagging purposes, a lance specifically refers to a style of spear popularly recognized from jousting (a cavalry charge), which has a distinct and large cone for its head intended to maximize the thrusting power on impact. The cone can be as long as, or even longer, than the actual haft. Lances are a popular symbol for a knight.
Not to be confused with "lances" in Fire Emblem games, which improperly use the term to refer to any kind of spear.
This tag implicates polearm (learn more).