Sorption is the process by which a substance is absorbed or adsorbed onto the surface of another material. It is a key phenomenon in various fields such as environmental science, chemistry, and engineering. Sorption can involve physical processes such as adsorption, where molecules or particles adhere to a surface, or chemical processes such as absorption, where substances are taken up by another material. This area of research is important for understanding how substances interact with surfaces and how they can be removed or controlled in various applications.