An insulator is a material or method that restricts the transfer of either heat or electricity. Insulators are used to protect us from the dangerous effects of electricity flowing through conductors. Insulators are materials that have just the opposite effect on the flow of electrons. They do not let electrons flow very easily from one atom to another. Insulators are materials whose atoms have tightly bound electrons. These electrons are not free to roam around and be shared by neighboring atoms. Some common insulator materials are glass, plastic, rubber, air, and wood. Most solid materials are classified as insulators because they offer very large resistance to the flow of electric current. A material used to resist the flow of heat is known as “Thermal insulation”. Thermal insulators work by reducing the rate heat can travel through a space. Basically, they use specific materials which will keep heat-carrying matter from moving. On the other hand, in case of electricity, Electrical insulators detain the electric current to a chosen path. They generally work by using a material with many outer electrons, a condition that will cause low electrical conductivity.