What is what does foil on a doorknob do?

Foil on a doorknob, also known as a "foil wrap hack," is a simple trick to prevent static electricity shocks when touching a doorknob. A small piece of aluminum foil is wrapped around the doorknob and secured with tape, creating a conductive path that allows static electricity to discharge harmlessly. This can be especially helpful during dry winter months when static electricity buildup is more common. The foil wrap hack is a temporary solution and may need to be replaced periodically as it can become worn or damaged over time.