A halberd deals as much damage as a sword and has a much larger knockback.
The halberd has a greater attack range and can switch attack modes between slashing and stabbing by right clicking. The stab attacks deal more damage, but slashing has a greater knockback.
It can be made out of all usual vanilla weapon materials, i.e. wood, stone, iron, gold, and diamonds.
Wood: 5 Damage (2 1/2 Hearts)
Stone: 7 Damage (3 1/2 Hearts)
Iron: 9 Damage (4 1/2 Hearts)
Diamond: 11 Damage (5 1/2 Hearts)
Gold: 5 Damage (2 1/2 Hearts) Has bigger knockback.
Wood: 6 Damage (3 Hearts)
Stone: 8 Damage (4 Hearts)
Iron: 10 Damage (5 Hearts)
Diamond: 13 Damage (6 1/2 Hearts)
Gold: 6 Damage (3 Hearts) Has bigger knockback.