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 achieving uniform thickness across multiple boards. This is particularly useful in furniture making and cabinetry, where precision is essential. The process of planing can enhance the appearance of wood by revealing its natural grain, making it a popular choice among woodworkers and carpenters.