* Unequal sharing of electrons: The oxygen atom in water is more electronegative than the hydrogen atoms. This means it pulls the shared electrons in the covalent bonds closer to itself, creating a partial negative charge (δ-) on the oxygen and partial positive charges (δ+) on the hydrogens.

* Bent shape: The molecule has a bent shape, with the two hydrogen atoms at an angle to the oxygen atom. This shape prevents the charges from canceling each other out, resulting in a net dipole moment.

This polarity is crucial for many of water's important properties, including:

* Solubility: Water is a good solvent for other polar molecules like sugars and salts.

* High boiling point: The strong hydrogen bonds between water molecules require a lot of energy to break, leading to a higher boiling point than expected for a molecule of its size.

* Surface tension: The attraction between water molecules at the surface creates a strong surface tension.

* Biological importance: Water's polarity allows it to participate in many biological processes, such as transporting nutrients and regulating temperature.