What does it mean to be a hammer or an anvil?
Similarly, you may ask, why is an anvil shaped that way?
The horn of the anvil is a conical projection used to form various round shapes and is generally unhardened steel or iron. The horn is used mostly in bending operations. It also is used by some smiths as an aid in "drawing down" stock (making it longer and thinner). Some anvils have more than one.
Beside this, who uses hammer anvil?
The hammer and anvil is a military tactic used since the beginning of organized warfare. It was used mostly in the ancient world, including by Alexander the Great and Eastern cataphracts.
There is no specific weight for an anvil. Most (but not all) anvils used for blacksmithing weigh between 75 and 500 pounds. When most people think “anvil” this is the sort of thing they are thinking of. Generally speaking, the heavier an anvil is, the better it will be forging work.