Insulators r the one which prevent heat/electricity from flowing through them. they used in various places in our day-to day applicants.we use them in 
making handles of utensils:so that when v hold them our hands may not burn
in coating copper wires:so that ther wont b any electrical shocks
they r very much helpful for us.v can continue our work safely by using them

Insulators are the object which do not allow heat/electricity to pass through them. The handle of utensils and screwdrivers, plastic switches, covering of a copper wire are some examples of insulators.