Gaskets are everywhere. They're in your car, at work, even in the air! A gasket is a common term used to describe any seal or grommet that holds two things together. You can make gaskets from rubber, plastic, metal, and other materials. The material choice depends on why you need to use a gasket. But as you'll learn, there's more to gaskets than a seal preventing a leak. Before you blow a gasket trying to work out the difference between each one, let us do the dirty work for you and tell you everything you need to know about gaskets!