Solubility Curves

Solutions are made up of two parts the solute and the solvent. The solute is what is dissolved in the solvent. The solvent is part of the solution that is in the largest quantity. 

There is a limit on how much solute can be dissolved in the solvent. There are three stages of how much solute can be dissolved in a solvent: unsaturated, saturated, and supersaturated. The graph below is a solubility curve this shows what compound is unsaturated, saturated, and supersaturated.
This link shows you how to read a solubility curve and gives you some practice reading them.