is a material that restricts the transfer of heat or electricity and these
are used to protect the dangerous effects of electricity flowing through conductors. Electrical insulators detain the electric current to a chosen path. They generally work by using a material with many outer electrons.
or cool air in your home
then work because it creates a boundary between the inside and outside walls!
Think of putting on an oven mit before you pick up a hot pan! The oven mit keeps the hot away from your hand!