Polar Molecule:A molecule with an uneven distribution of charge, resulting in some regions being more negative or positive than others. Water is an example of this due to its bent shape.
Covalent Bond: A type of chemical bond where electrons are shared between atoms. In water, covalent bonds exist between the oxygen and hydrogen atoms.
Hydrogen Bonding: A weak bond between two molecules resulting from an electrostatic attraction between a proton in one molecule and an electronegative atom in the other. This occurs frequently in water molecules.