Circumstellar environments refer to the regions of space surrounding a star, where various physical processes and interactions take place. This research area explores the properties and dynamics of material, such as dust and gas, that is in close proximity to a star. By studying the circumstellar environment of different types of stars, researchers can gain insights into stellar formation, evolution, and interactions with their surroundings. Key topics within this field include the formation of planetary systems, the evolution of protoplanetary disks, and the interaction between stars and their surrounding material. Observational techniques such as spectroscopy and imaging are commonly used to study circumstellar environments.