What do you mean by the unsaturated and saturated solution ?

Unsaturated solution

A solution in which more solute can be dissolved at any fixed temperature is called an unsaturated solution. For example, a solution of sugar in which more sugar could be dissolved without changing its temperature is called an unsaturated solution of sugar.

Saturated solution

A solution in which no more solute can be dissolved at any fixed temperature is called a saturated solution. In other words, a solution which contains the maximum possible amount of solute at any given temperature is called a saturated solution.