Why is the hydrogen-chlorine bond polar?

The hydrogen-chlorine bond is polar because of the difference in electronegativity between the two atoms.12

Electronegativity is the power of an atom to attract shared electrons toward itself within a chemical bond. In a hydrogen chloride molecule, chlorine is more electronegative than hydrogen. Consequently, chlorine draws the shared electron pair closer to itself, acquiring a partial negative charge. Conversely, the hydrogen atom loses its equal share of the bonding pair, resulting in a partial positive charge.132

This unequal distribution of electrical charge creates an electric dipole, which signifies that the bond is polar. The presence of these partial charges is a direct result of the elements' differing abilities to attract electrons, distinguishing this heteronuclear bond from nonpolar bonds found between identical atoms.12