Environmental quenching is a research area in astrophysics and cosmology that focuses on understanding the mechanisms by which galaxies stop forming new stars in dense environments such as galaxy clusters or groups. This process, known as "quenching," is crucial for shaping the properties and evolution of galaxies. Researchers study environmental quenching to investigate how interactions with other galaxies, gravitational interactions, or other processes within dense environments can suppress star formation in galaxies. This can lead to a better understanding of the relationship between galaxy evolution and their surrounding environment. Overall, environmental quenching research aims to uncover the physical processes that drive the transformation of galaxies from actively star-forming to quiescent in dense environments.