Answer: hydrogen bonds
Explanation:
Water molecules are polar because they have a partial positive charge on the hydrogen atoms and a partial negative charge on the oxygen atom, due to the difference in electronegativity between hydrogen and oxygen. This polarity enables water molecules to form hydrogen bonds with each other and with other polar molecules. The partial positive charge of the hydrogen atom in one water molecule is attracted to the partial negative charge of the oxygen atom in a neighboring water molecule, creating a hydrogen bond. These hydrogen bonds are responsible for many of water's unique properties, such as high surface tension, cohesion (water molecules sticking to each other), adhesion (water molecules sticking to other polar surfaces), and its relatively high boiling and melting points.