So unlike gravity, unlike the gravitational force, the electric force that essentially holds and allows the interaction between atoms and molecules is both attractive and, in some cases, repulsive in nature, depending on the type of charges that are found in close proximity. And all the different types of bonds we're going to discuss in this lecture are electric in nature. So we have two categories of bonds. We have intramolecular bonds and we have inter molecular bonds. Intramolecular bonds are the bonds that hold the atoms together within a given molecule. And intermolecular bonds are those bonds that hold atoms together on different molecules.