Silicone is a synthetic polymer made up of silicon, oxygen, carbon, hydrogen and sometimes other elements. They are typically heat-resistant, either liquid or rubber-like, and are used in sealants, adhesives, lubricants, medicine, cooking utensils, and thermal and electrical insulation. Some common forms include silicone oil, silicone grease, silicone rubber, silicone resin, and silicone caulk.