What is the difference between covalent polar and non-polar bonds?

Polar covalent bonds are characterized by the presence of an unequal distribution of electrons of the two elements. They also retain a positive and negative pole, which allows them to have a certain electronegativity. On the other hand, non-polar covalent bonds are described as having electrons that are similar or nearly equal in number of electrons. This characteristic makes them equally or less electronegative.

Polar covalent bonds have a charge (due to the presence of both positive and negative poles), whereas non-polar covalent bonds have no charge.