A flathead screwdriver, also known as a slotted screwdriver, is a hand tool used for driving screws with a straight, flat blade. The blade fits into the single slot on the head of the screw, allowing for easy turning. Flathead screwdrivers come in various sizes, making them suitable for different screw types and applications. This tool is commonly used in woodworking, electronics, and general household tasks. While it is one of the oldest types of screwdrivers, it is still widely used today. However, it is important to note that Phillips screwdrivers have become more popular for certain applications due to their design, which provides better grip and torque.