Green Chemistry is the use of chemistry techniques and methodologies that reduce to eliminate the use or generation of feedstock, by-products, solvents, reagents, etc., that are hazardous to human health or environment. Green Chemistry is an approach to synthesize, process and use of chemicals that reduces the risk to human health or environment. US chemist, Anastas has pointed out the guiding principle is the design of environmentally sustainable products and processes. This concept is embodied in the 12 Principles of Green Chemistry. Environmentally benign solvents have been one of the leading research areas of Green Chemistry with great advancements seen in chemical reactions. New catalytic reaction processes continue to emerge to advance the goals of Green Chemistry, while techniques such as photochemistry, microwave and ultrasonic synthesis as well as spectroscopic methods has been extensively used, leading to spectacular results. Green Chemistry aims to eliminate generation of hazards at their design stage itself.