What are the key differences between a wood planer and a jointer, and how do they each contribute to the woodworking process?

A wood planer is used to make a board's surface flat and smooth, while a jointer is used to create a straight edge on a board. The planer is for thickness and surface finishing, while the jointer is for edge straightening and squaring. Both tools are essential for preparing wood for precise and professional woodworking projects.