Door handles are mechanical devices used to open and close doors. They come in various styles, materials, and sizes, including metal, plastic, and wood. Common types include lever handles, knobs, and pull handles, each designed for different door types and user preferences. The function of a door handle is to provide a means for users to grasp and manipulate the door. Some door handles also include locking mechanisms for added security. Proper installation and maintenance of door handles are essential for ensuring their durability and functionality over time.