Accurate atomic and molecular data is essential for understanding our universe - the Earth, the Sun and all manner of Astrophysical objects, atmospheres as well as high-temperature plasma resulting from fusions. The book's direct interest lies in data for collisional processes involving electrons, protons and photons - the results of which are essential to our understanding of phenomena such as global warming. This branch of research interests and impacts numerous fields of engineering, deeming the role of Atomic and Molecular physics as central in a wide range of fields.