Polarity simply implies a molecules with positive and negatively charged ends.
The two hydrogen atoms and one oxygen atom within water molecules (H2O) form polar covalent bonds.
While there is no net charge to a water molecule, the polarity of water creates a slightly positive charge on hydrogen and a slightly negative charge on oxygen, contributing to water's properties of attraction.
The oxygen is negative and the hydrogen is positive, so it has a slightly negative side and a slightly positive side. (like a magnet has opposite ends)
