What tool can be used to cut crescent shaped grooves into the edge of molding to form a joint?

The biscuit joiner is specifically designed for creating precise joints in woodworking by cutting crescent-shaped grooves, known as biscuit slots, into the edges of two pieces of wood or molding. This tool works by using a specialized blade that borrows its shape from the common biscuit, creating a slot that allows for the insertion of a biscuit (a small, oval piece of wood) to connect the two pieces together.

This method is highly regarded for its ability to provide strong, aligned joints, making it particularly useful in cabinetry, furniture making, and for joining trim or molding to ensure a seamless appearance. The biscuit joiner's unique function is what sets it apart from other tools like a table saw or a router, which are used for different types of cuts and joints. While a router can create grooves as well, it typically requires more skill and precision compared to the biscuit joiner's design which simplifies the process.