Occurs when there is an unequal sharing of electrons between atoms

Polarity occurs when there is an unequal sharing of electrons between atoms.

Explanation:

Polarity is separation of an electrical charge in molecule.

This polarity in the molecule is due to unequal sharing of electrons between the atoms due to which partial positive and partial negative charges gets created in the molecule.

This creation leads to formation of a dipole and a polar bond in a molecule.

One of the main reason behind the formation of polar bonds is electronegativity difference between the two atoms bonded together.