Solubility is the ability of a substance, known as the solute, to dissolve in a solvent to form a homogenous mixture called a solution. The solubility of a substance depends on the chemical nature of both the solute and the solvent, as well as external factors such as temperature, pressure, and the amount of solute or solvent. Substances that dissolve readily in a solvent are considered to be soluble, while those that do not are insoluble. Understanding solubility is important in many fields, including chemistry, biology, and environmental science.