Screws are fasteners used to join materials together, providing a strong and secure connection. Screws come in various types, including wood screws, machine screws, and sheet metal screws, each designed for specific applications. They are available in a range of sizes and materials, such as steel, brass, and stainless steel, to suit different projects. Shopping for screws online provides a variety of options, ensuring you can find the right screw for your construction or repair tasks.