Fermentation types are classified into different classes based on various aspects like based on feeding substrate to fermenter, based on need of supply of aeration, based on need of light etc. Based on feeding substrate to fermenter, Batch fermentation, Continuous fermentation and Fed-batch fermentation are the key modes. In batch fermentation, every material for process of fermentation including substrate, inoculum and all the process parameters are set and filled in a fermenter and the process is set on and until the total process comes to an end neither substrate is added into fermenter nor product is taken out of fermenter. It’s a closed system. In continuous fermentation, the substrate is added continuously to the fermenter at a fixed rate which maintains the microbes at logarithmic growth phase and the products that are formed are taken out simultaneously and here we find growth associated products.