A solution is a homogeneous mixture of two or more components that may be gases, liquids or solids. (E.g.: our salt water above is a mixture of water, a liquid and salt, a solid; rubbing alcohol contains two liquids, water and alcohol).

The solvent of a solution is the substance that is present in the greatest quantity (in seawater, the solvent is water. Water is the body's chief solvent)

The solutes of a solution are the substances present in smaller quantity (in saltwater, the solute would be ions Na+ and Cl-, in a solution of glucose, it would be the glucose molecules).

We know also that in a solution, solvent molecules and solute molecules move about randomly and with relative freedom. The only restrictions to the freedom of movement of these molecules are the weak electrostatic attractions that exist between opposite charges on different molecules.