A screwdriver is a tool used to tighten or loosen screws. It consists of a handle and a steel blade, which can often have a slotted or cross-slotted shape to fit different types of screw heads. The handle can be made of wood, plastic or metal and is ergonomically designed to provide a secure and comfortable grip. Screwdrivers are available in different sizes to fit screws of different sizes. They are an indispensable tool in many fields such as woodworking, metalworking, electronics, engineering and everyday use.