Now-a-days Green marketing is very popular day by day. It is the new concept being adopted all over the world. In order to preserve and protect the earth’s natural environment and finite resources, both the marketers and the consumers are nowadays focusing on green products and services. It is the new aspect of the marketing field. The world is going Green and so are the companies. Now going green has become the new success mantra in marketing to differentiate the products and services from their competition. It has also become a platform for innovation. Now, more and more organizations are trying to follow the green path either directly or indirectly. This paper describes the concept of green marketing and its relevance for the companies. It highlights the five important reasons that companies go in for green marketing namely, providing an opportunity, being socially responsible, due to governmental pressure, due to competitive pressure and due to cost or profit issues.