Green chemistry is rapidly emerging branch of chemistry which is environmentally benign. It leads the designing of chemical substance in such a way which minimizes the production of hazardous chemical products and by products, in part no adverse effect on environment and reduced health risk. Green chemistry plays an important role in pharmaceutical industries in developing innovatory drug synthesis which are less toxic for human health, useful for patients, with minimum side effects. This paper presents principles of green chemistry and its enormous applications in everyday life.