* Electronegativity: Oxygen (O) is significantly more electronegative than hydrogen (H). This means oxygen has a stronger pull on the shared electrons in the bond.

* Unequal Sharing: The unequal sharing of electrons creates a partial negative charge (δ-) on the oxygen atom and a partial positive charge (δ+) on the hydrogen atom.

* Dipole Moment: This uneven distribution of charge creates a dipole moment, a measure of the polarity of the molecule.

Therefore, the OH bond is polar covalent.