Fermentation types are classified into different classes supported various aspects like supported feeding substrate to fermenter, supported need of supply of aeration, supported need of sunshine etc. supported 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 every one the method parameters are set and filled during a fermenter and therefore the process is about on and until the entire process involves 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 hard and fast rate which maintains the microbes at logarithmic growth phase and therefore the products that are formed are taken out simultaneously and here we discover growth associated products. In fed-batch mode we discover both modes of operations of batch and continuous modes, where substrate is added at fixed time intervals during the fermentation process. Supported need of supply of aeration there are aerobic fermentation and anaerobic fermentation. Aerobic fermentations: albeit called fermentation, many large-scale fermentation processes are administered in presence of aerobic conditions where, the contents present in fermenter are agitated with the assistance of agitator and with the assistance of spargers by forcing sterilized air into the fermenter. Anaerobic fermentation: aside from intense need and presence of agitator and sparger to provide aeration, remainder of the configuration of the fermenter is as same as aerobic fermentation. But the presence of agitator is formed compulsion for the even distribution of temperature, pH, viscosity, nutrients etc. along the medium within the fermenter. Anyways, micro aerophilic conditions to anaerobic conditions are needed to initiate the expansion of the microbe within the fermenter. Supported need of sunshine a. photo fermentation (only photosynthetic bacteria can undergo) and Dark fermentation. Photofermentation may be a process of conversion of organic substances to other utilisable energy compounds following a series of biochemical reactions administered by a selected group of bacteria named Photosynthetic bacteria, which only proceeds within the presence of sunshine. Dark fermentation in every way it's almost like that of photofermentation, but in aspect of need of sunshine, dark fermentation doesn't need any light to initiate the reactions and a diversified group of microbes are involved in dark fermentation. Open access (OA) may be a set of principles and a variety of practices through which research outputs are distributed online, freed from cost or other access barriers. With open access strictly defined (according to the 2001 definition), or libre open access, barriers to copying or reuse also are reduced or removed by applying an open license for copyright. The most focus of the open access movement is "peer reviewed research literature." Open access are often applied to all or any sorts of published research output, including peer-reviewed and non-peer reviewed academic journal articles, conference papers, theses, book chapters, and monographs.