A carbide saw is a saw with very tiny teeth made out of a super hard material called carbide. These teeth are so small and close together that they can cut through things very easily, like wood or metal. The carbide material is much harder than the metal or wood it's cutting through, so it can make the job go faster and with less effort. It's like having super strong, tiny little knives that slice through stuff instead of sawing it apart. Carbide saws are used by people who need to cut things very precisely, like carpenters or metalworkers, and are often attached to a machine that makes the cuts for them.