Netherite armor is the strongest armor in Minecraft, providing the most protection from damage. It is also very durable, but it can still be damaged over time. When netherite armor is damaged, it can be repaired using a smithing table and a netherite ingot.
To repair netherite armor, place the damaged armor piece in the top left slot of the smithing table. Then, place a netherite ingot in the bottom right slot. The netherite ingot will be consumed and the armor piece will be repaired.