Screws are a type of fastener that are used to join two or more pieces of material together. They have a helical thread that cuts into the material and creates a strong bond. Screws are used for various purposes, such as assembling furniture, attaching hardware, securing structures, and repairing objects. Screws have many benefits, such as being easy to install and remove, providing a tight and adjustable fit, and resisting corrosion and wear.