Bioreactors are vessels or devices in which biological reactions or processes are carried out. Bioreactors provide a controlled environment for the growth of microorganismsMicroorganisms are living beings that cannot be seen with the naked eye. ‘Micro’ is a prefix tha, cells, or tissues for various industrial and scientific applications. A common type of bioreactor used for growing cells is a stirred-tank bioreactor, which consists of a cylindrical vessel with an agitator to mix culture medium and maintain uniform growth of cells.