A saturated solution is a solution that contains a certain amount of solute that is enough to be dissolved in the solvent. Anything above that amount will not dissolve some of the solute in the solvent. When a saturated solution is cooled, the solubility of the solute lowers making the solution supersaturated.
A saturated solution contains the right amount of solute that it can normally hold at that temperature.
If a saturated solution is cooled below the given temperature at which the solution is prepared, then the solubility of the solute will decrease. Also, when this solution is heated, the crystals would dissolve in the solution and no longer be visible.
