Photochemical processes involve chemical reactions that are triggered or controlled by light. These reactions typically occur when a molecule absorbs light energy and undergoes a change in its electronic structure, leading to the formation of new chemical species. In photochemical research, scientists study the mechanisms and outcomes of these light-induced reactions and explore their applications in various fields such as organic synthesis, photocatalysis, and photobiology. By understanding and manipulating photochemical processes, researchers can develop new methods for producing valuable compounds, designing novel materials, and harnessing solar energy for sustainable applications.