Lances are rather tricky to use, only dealing a small amount of damage on their own, but more than doubling when wielded atop a mount. This can be any vanilla mount; horses, striders, even pigs.
As its durability is lowered, the a Lance will start to oxidize, being made of copper. When repaired either using iron ingots at an anvil, or using the Mending, enchantment oxidation will not be reversed, so you can choose one look and stick with it.
Adapting to Lance combat takes time, and is rather risky, as you may be caught in a corner that a large mount cannot get out of. But the Lance's raw damage is only rivaled by the obviously more powerful Mace when properly enchanted.