Non-polar covalent bonds are covalent bond that formed between 2 similar atoms [homo-atoms]; the shared pair of electrons is attracted by both the atoms equally. For example, bond formation in H2 and Cl2. Polar covalent bonds are covalent bonds that formed between 2 different types of atoms [hetro-atoms]; the bond pair of electron will not be attracted equally by the bonded atoms. For example: H2O, HF and HCl.