Anions are negatively charged ions that are commonly found in chemistry and physics research. They play a crucial role in various chemical reactions and in the structure and function of molecules. Anions are often involved in processes such as ion exchange, acidity, and corrosion. Research on anions includes studies on their behavior, properties, and interactions with other molecules. This area of research is important in understanding the role of anions in biological systems, environmental processes, and industrial applications.