NaCI is not polar. NaCI or sodium chlroride is an ionic compound, which is comprised of positive Na and negative CI ions. To form an ionic compound, a metal reacts with a non-metal. Metals become positive ions while non-metals become negative ions for creating strong ionic bonds.
Due to its huge ionic lattice structure, NaCI is a crystal. It has high boiling and melting points because of its strong ionic bonds, which require much energy for breaking. This is in contrast with covalent bonds that can be polar or non-polar and normally have low melting and boiling points. In liquid form, NaCl can conduct electricity, unlike a substance with a polar bond.