If you are not part of the solution, you are part of the precipitate . It is always formed by at least two substances. One of them is solvent , the others are solutes . Dilute and concentrated solutions. Dilute solution is the one where the ratio of solute to solvent is very small.
Concentrated solution is the one where the ratio of solute to solvent is large.
Saturated, unsaturated and supersaturated solutions. If it is not possible to dissolve more of the solute at a given temperature it gives a saturated solution . If it is possible to dissolve more, the solution is called unsaturated . Supersaturated solutions . Can be made sometimes by careful cooling of a saturated solution.