An anion is an ion with a negative charge, while a cation is an ion with a positive charge. Anions are formed when an atom or molecule gains electrons, while cations are formed when an atom or molecule loses electrons. Anions and cations are both found in the same substances, such as salt or other ionic compounds. Anions and cations interact with each other through electrical forces, which cause them to form ionic bonds. These ionic bonds are the basis of many chemical processes, such as the formation of salt. Anions and cations can also interact with each other in aqueous solutions, forming solutions referred to as electrolytes. Electrolytes are important for many biological processes, such as the transport of nutrients and waste products in the body.