This book presents an important account of information on Infrared (IR) and Near Infrared (NIR) Spectroscopy, both of which are non-invasive imaging procedures. The researches encompass various topics presented by prominent stalwarts from the respective fields. It brings forth a detailed view of advancements in the sphere of functions of IR under the section minerals and glasses, which describes identifying amorphous phases of materials, glasses, rocks and minerals, catalysts, as well as peat in reaction processes. The aim of this book is to create a common ground for discussion on diverse fields related to spectroscopic techniques and boosting interaction among experts.