Complexation is the process of combining two or more chemical species to form a complex. It is an important concept in chemistry as it can significantly affect the behavior of a solution. There are various synonyms for complexation that are commonly used in chemistry, including coordination, chelation, and ligand binding. Coordination refers to the formation of a coordination compound. Chelation refers to the binding of a ligand to a metal ion. Ligand binding refers to the formation of a complex between a ligand and a metal ion. All of these processes involve the formation of a complex and are essential in understanding the behavior of chemical systems.