What are saturated, unsaturated and supersaturated solutions?

A Saturated solution is a solution that has dissolved the MAXIMUM amount of .

An Unsaturated solution describes a solution that has a LESS than the max amount of solute dissolved.

A Supersaturated solution describes a solution that has dissolved MORE than the maximum amount of solute, reached by heating then cooling.

If you also need to know solubility curves:

A saturated solution would be on the line.

An unsaturated solution would be below the line.

A supersaturated solution would be above the line.