Kamala Bradecich (Neonatal Nursing)

You can think about solutions in a couple of ways. The most common way is based on concentration.

An unsaturated solution can still dissolve more of a substance. Think of a weak cordial. A saturated solution is completely full. It can't dissolve any more solute at that temperature. Then you have a supersaturated solution. This is a special case, holding more solute than it should and is very unstable.

Solutions are also classified by their physical state. For instance, you can have a solid in a liquid (saltwater) or even a gas in a gas (like the air we breathe).