Router bits are tools used on routers, which are mechanical tools used to cut, drill, grooving, and chamfer materials such as wood, plastic, and light metal. Router bits come in many shapes and sizes, and each has a different use depending on the job being done.

Common types of router bits include:

1. Straight Bit: Used for drilling or carving straight grooves in materials.
2. Chamfer Bit: Used to remove the edges of materials to make them look beautiful.
3. V-Groove Bit: Used to create a V-shaped groove in materials.
4. Round-Over Bit: Used to remove edges to form a curve.
5. Profile Bit: Used to create a profile or pattern on the edge of a material.

Router bits are made of durable materials such as carbide or high-speed steel (HSS) and have a sharp edge that can cut and drill through materials efficiently.