What’s the difference between a polar and a nonpolar covalent bond

A covalent bond that has an unequal sharing of electrons, as in part (b) of Figure 4.4. 1, is called a polar covalent bond. A covalent bond that has an equal sharing of electrons (part (a) of Figure 4.4. 1) is called a nonpolar covalent bond.

it should be all of them because it asks if you included all of those in your answer

explanation:

i just learnt this recently but i need to look through my notes again