Streptomyces is the genus of the fungus. This group is known to be the largest producer of antibiotic in this world. The species are responsible for producing a maximum number of antibiotics. The number of the antibiotics which are produced increases every year. They synthesize the antibiotics which have a wide range of activity like antibacterial, antifungal and antiparasitic. They are also known to produce certain compounds which can act as immunosuppressants