Abstract：In the last two decades, the field of exoplanets has witnessed a tremendous creative surge. Research in exoplanets now encompasses a wide range of fields ranging from astrophysics to heliophysics and climate science. One of the primary objectives of studying exoplanets is to determine the criteria for habitability, and whether certain exoplanets meet these requirements. The classical definition of the Habitable Zone (HZ) is the region around a star where a planetary surface can support liquid water, but this definition largely ignores the impact of the stellar wind and stellar magnetic activity on the erosion of an exoplanet’s atmosphere. Amongst the many factors that determine habitability, understanding the atmospheric loss is of paramount importance. Most of the recent attention has been centered around the study of exoplanets orbiting M-dwarfs since the latter are highly numerous in our Galaxy (and in the Universe). The study of these exoplanets has also received a major boost from the discovery of Proxima b (Pb) and seven Earth-sized planets in the TRAPPIST-1 system.