What chemical bond is called a covalent bond? What covalent bond is called a covalent non-polar bond?

What chemical bond is called a covalent bond? What covalent bond is called a covalent non-polar bond? Give two examples of compounds with a covalent non-polar bond.

A covalent bond is a chemical bond resulting from the formation of common electron pairs.
In the case when a common electron pair is equally attracted to the nuclei of interacting atoms, the covalent bond is called non-polar, for example, in H2, O2, Cl2, N2.

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