What is foil around door knob?

Foil around door knob is a cheap and effective method to prevent static electricity buildup and shocks. The foil acts as a conductor, discharging any electrical charge that might have accumulated around the door knob. It is especially useful during dry winter months when static electricity is more common. The foil is easy to apply, simply wrapping it around the shaft of the door knob. However, it is important to ensure that the foil is properly grounded to prevent any potential electrical hazards.