are interactions involving polar molecules. Hydrogen bonding is an extreme case, but polar molecules in general will "connect" with one another at close range and form clumps. The strength of the dipole for otherwise similar molecules can be judged by properties like boiling point, solubility, etc.

There are several sub-categories of dipole forces.

Obviously polar molecules will interact with one another. But ions and polar molecules can also interact. That is why most ionic compounds are soluble in water. .

Polar molecules may also induce a temporary dipole on non-polar molecules, especially those with excellent shielding. This is akin to making a temporary magnet out of a nail by rubbing a magnet on it or leaving it in contact with a magnet for a time, although the force involved here is electric and not magnetic. This effect can be seen in something as simple as iodine dissolving in water.