What are the key differences between a plunge router and a fixed base router, and how do these differences impact their performance and versatility in woodworking projects?

A plunge router allows the bit to be lowered into the material while a fixed base router keeps the bit at a set height. This difference in movement affects the precision and depth control of cuts. Plunge routers are more versatile for intricate designs and mortises, while fixed base routers are better for consistent, straight cuts. Overall, the choice between the two depends on the specific woodworking project and desired outcome.