The document defines key terms related to solubility including solvent, solute, solution, mixture, and saturation point. It explains that solubility is a characteristic property expressing the maximum amount of solute that will dissolve in a solvent. The document also notes that the point where the x and y axes intersect on a solubility graph is called the saturation point. It provides tips for increasing the rate at which a solute dissolves, such as increasing surface area, temperature, or rate of mixing.