A planer is a woodworking tool used to create flat surfaces on lumber. It removes material from the surface of a board to achieve a desired thickness and smoothness. Planers can be manual or electric, with electric models being more common in modern workshops. In addition to smoothing surfaces, planers can also help in shaping wood for specific projects. They are often used in conjunction with other tools, such as jointers and saws, to prepare wood for furniture making or construction. Proper use of a planer ensures a clean finish and accurate dimensions in woodworking projects.