What does a bar clamp do and how is it used in woodworking projects?

A bar clamp is a tool used in woodworking to hold pieces of wood together while glue dries or when making cuts. It applies pressure evenly across the surface of the wood to ensure a strong bond. Woodworkers use bar clamps by adjusting the length of the bar to fit the size of the project, then tightening the clamp to secure the pieces in place until the glue sets.