Final answer:
A bond where two or more atoms share electrons is known as a covalent bond, which can be either nonpolar or polar based on the equality of electron sharing.
Step-by-step explanation:
Covalent bonds form when electrons are shared between atoms and are attracted by the nuclei of both atoms. There are two types of covalent bonds: nonpolar and polar. A nonpolar covalent bond is one in which the electrons are shared equally between two atoms, resulting in no permanent dipole moment. Conversely, a polar covalent bond occurs when there is unequal sharing of electrons because one atom has a greater attraction for the electrons than the other, leading to a separation of charge and a dipole moment. When the relative attraction of an atom for electrons is great enough, leading to one atom donating an electron to another, the bond is an ionic bond.