Here's a breakdown:

* Polarity: Water molecules are polar, meaning they have a slightly positive end (near the hydrogen atoms) and a slightly negative end (near the oxygen atom). This occurs because oxygen is more electronegative than hydrogen, pulling the shared electrons closer to itself.

* Attraction: The positive end of one water molecule is attracted to the negative end of another water molecule. This attraction is called a hydrogen bond.

* Strength: Hydrogen bonds are relatively weak compared to covalent bonds, but they are still important because they hold water molecules together, giving water its unique properties.

Properties of water that are due to hydrogen bonding:

* High boiling point: Water has a higher boiling point than expected for its molecular weight due to the energy required to break the hydrogen bonds.

* High surface tension: Water molecules at the surface are more strongly attracted to each other than to the air, creating a strong surface tension.

* Universal solvent: Water's polarity allows it to dissolve many substances, making it a good solvent.

In summary, hydrogen bonding is the force that holds water molecules together and gives water its unique properties.