For example, in proteins and in DNA, it's the inter molecular bonds that basically allow that three dimensional structure to actually exist in the first place. And we'll see exactly what we mean by that in future lectures. So let's discuss two important types of inter molecular bonds that you should be familiar with in your study of biochemistry. So we have hydrogen bonds and London dispersion forces. So a hydrogen bond is a specific type of a dipole dipole interaction, dipole dipole bond. In fact, hydrogen bonds are the strongest type of intermolecular bonds, as we'll see in just a moment.