Common screws are fasteners used to hold objects together. They typically have a cylindrical shaft with a helical ridge, known as a thread, that allows them to grip materials like wood, metal, or plastic. The head of the screw can be designed for different types of tools, such as flathead, Phillips, or Torx screwdrivers, making them versatile for various applications. Screws come in different sizes and materials, including stainless steel, brass, and plastic, to suit specific needs. They are widely used in construction, furniture assembly, and machinery. Understanding the types of screws and their uses can help in selecting the right one for a project.