Final answer:
Covalent bonds involve the sharing of electrons between atoms. They can be either polar or nonpolar depending on the electronegativities of the atoms involved.
Step-by-step explanation:
Covalent bonds involve the sharing of electrons between atoms. When two atoms of different elements are bonded together by a covalent bond, the electrons are generally not shared equally between the two atoms due to differences in their electronegativities. This unequal sharing of electrons can result in polar covalent bonds or nonpolar covalent bonds.
For example, in a molecule of hydrogen (H2), two atoms of hydrogen each share their solitary electron in a single covalent bond. Therefore, the term 'covalent bonds' matches the phrase 'bonds that involve the sharing of electrons between atoms.'