To make things clear we can use a simple example. We take a bowl of water to which we add sugar crystals. We keep adding sugar to it until we reach a stage when no more crystals can be dissolved. This solution is now a saturated one. It is interesting to note that we can dissolve more crystals to this particular saturated solution by heating it. Solubility of solutes increases with increase in temperature, but there are exceptional cases. This increase in temperature causes more sugar crystals to dissolve (so forming a supersaturated solution), but when the temperature of the solution cools down, the solubility of the solute decreases This is because the temperature of the solution has decreased, and the 'excess' sugar crystallizes out. This process illustrates the simplest of supersaturation techniques. 