The term "solubility" refers to the maximum amount of a solute that may dissolve in a known volume of solvent at a specific temperature.
A solution is a homogenous combination of one or more solutes in a solvent. Sugar cubes added to a cup of tea or coffee are an example of a solution.
The characteristic that causes sugar molecules to dissolve is solubility. Therefore, a substance's solubility may be defined as its capacity to dissolve in a certain solvent.
The mass of the solute per 100 grams of water is how the solubility is always expressed.