Medicinal plants are known to play an important role in tribal and rural health. However, in recent times it has been equally accepted and adopted by urban people. Around the world, medicinal plants have played an important role in traditional medicine and knowledge to treat various diseases and ailments. It has also acted as a source of natural or synthesized compounds for traditional and modern drugs. Some of these medicinal plants which were also part of daily food improved the general immune system of the people. In this review, we try to cover various aspects of medicinal plants including their diversity, ecology, and applications