How is electronegativity used to determine bond polarity

The greater the difference in electronegativity is the more polar the bond is.

Explanation:

If an atom or molecule is electronegative it means it strongly attracts the electrons of an atom while in a bond. So if you have on highly electronegative element and one not so electronegative element, the more electronegative element will attract electrons stronger, giving it a slightly negative charge, while the other end will have a slightly positive charge. This creates a polar bond. However, if there are similar electronegativity then both atoms will attract electrons equally creating a non-polar compound. This is common in when identical atoms bond. But, a compound can have polar bonds but still be non-polar. For example, carbon dioxide (CO2). The carbon is in the middle and oxygen, the more electronegative are on both sides pulling the electrons. This cancels out and creates a non-polar compound.