Here's why:

* Saturated solution: A solution that contains the maximum amount of solute that can dissolve at a given temperature and pressure. Adding more solute will not dissolve, and it will typically precipitate out.

* Unsaturated solution: A solution that contains less than the maximum amount of solute that can dissolve at a given temperature and pressure. More solute can be added and dissolved.

* Supersaturated solution: A solution that contains more solute than the maximum amount that can dissolve at a given temperature and pressure. These solutions are unstable and tend to precipitate out excess solute.

Therefore, a solution that contains the maximum amount of solute is a SATURATED solution, not an unsaturated solution.