High Energy Astrophysics plays a key role in understanding the universe. These radiations reveal the processes in the hot and violent Universe. This science also probes hot gas in clusters of galaxies, which are the most massive objects in the Universe. It also probes hot gas accreting around supermassive black holes in the centers of galaxies. Finally, high energy radiation provides important information about our own Galaxy, neutron stars, supernova remnants and stars like our Sun which emit copious amounts of high energy radiation.