What is foil on doorknobs?

Foil on doorknobs can be used as a DIY way to reduce the spread of germs. The idea is that by covering the doorknob with foil, any germs on the surface will be trapped and unable to spread. This is especially useful during cold and flu season or during outbreaks of illness. However, it's important to note that this method should not be relied on as the sole means of germ prevention. Regularly cleaning surfaces and washing hands is still the most effective way to reduce the spread of germs.