The electronic structure is one of the fundamental properties of matter, and as such has been significant developments in new methods, both theoretical and experimental, for investigating these properties. Electron spectroscopic techniques have been playing a vital role in elucidating the origin of various exotic properties of materials, like Graphene, Topological Insulators, Superconductors and other correlated systems which are frontier areas of research in Condensed matter physics. Studies based on electron spectroscopy have been growing rapidly during the past decades, which prompted the development of big facilities like synchrotron sources around the globe.