Nonpolar covalent bonds are a chemical bond that exists between two atoms. This bond is formed when electrons are equally shared between two atoms. These bonds can be either formed between two identical atoms or between different atoms. (This is the opposite of polar molecules, which do not share electrons equally and therefore contain atoms with partial positive and negative charges.)
An example of a nonpolar covalent bond is the bond between two hydrogen atoms because they equally share the electrons. Another example of a nonpolar covalent bond is the bond between two chlorine atoms because they also equally share the electrons. Nonpolar covalent bonds are very strong bonds requiring a large amount of energy to break the bond.