Chemistry is all around the universe. Green chemistry underpins the enormous social and technological changes in the future. Beginning from eco-friendly chemical synthesis to green catalyst via green chemical reactions, it finds a good correlation with the environment, taking biosynthesis and biomimetic principles into consideration. Widespread interest in this field is seen today among scientists. Considering the present scenario of “The age of tools”, the compatibility with technology today is of utmost importance. Green chemistry is one of the powerful tools to cut the Gordian knot of pollution by reducing chemicals in the surroundings to make them eco-friendly. This chapter emphasizes the various aspects of green chemistry, from its principles to its applications, leading to a sustainable eco-friendly future.