Polarity:Polarity refers to the distribution of electric charge in a molecule. Polar molecules have uneven charges which allow them to interact with other polar substances like water.
Solubility: Solubility is the ability of a substance (solute) to dissolve in a solvent (like water). Hydrophilic substances are generally soluble in water due to their polarity or charge.
Hydrophobic Part:The hydrophobic part of a molecule is repelled from water. It's typically nonpolar and does not dissolve well in water.