What are the different types of spoke washers used in bicycle maintenance?

There are two main types of spoke washers used in bicycle maintenance: flat washers and concave washers. Flat washers are thin, circular discs that sit flat against the spoke, while concave washers have a curved shape that conforms to the shape of the spoke. Both types of washers help distribute the pressure from the spoke nipple more evenly, reducing the risk of damage to the rim or spoke.