* Uneven Sharing of Electrons: The oxygen atom in water is more electronegative than the hydrogen atoms. This means it attracts the shared electrons in the covalent bonds more strongly. This results in the oxygen atom having a slightly negative charge (δ-) and the hydrogen atoms having slightly positive charges (δ+).

* Bent Molecular Shape: The water molecule has a bent shape, like a V. This shape, along with the uneven electron distribution, creates a separation of charge within the molecule. The oxygen side has a negative pole, and the hydrogen side has a positive pole.

In summary, the polarity of a water molecule arises from its asymmetrical shape and the unequal sharing of electrons between the oxygen and hydrogen atoms.