A Bioreactor refers to any manufactured device or system that supports a biologically active environment. In one case, a bioreactor is a vessel in which a chemical process is carried out which involves organisms or biochemically active substances derived from such organisms. An apparatus, such as a large fermentation chamber, for growing organisms such as bacteria or yeast under controlled conditions. Bioreactors are used in the biotechnological production of substances such as pharmaceuticals, antibodies, or vaccines, or for the bioconversion of organic waste. A bioreactor is a manufactured device where a biological reaction is carried out. ... Bioreactors are usually cylindrically shaped, and range in different sizes from litres to cubic meters. They are commonly made of stainless steel. Bioreactors are used for making pharmaceutical products such as antibiotics and insulin. There are many different types of bioreactors including: stirred-tank, rocker, air lift and fixed-bed. Traditional multiple-use bioreactors require cleaning after each cell culture run. Smaller-scale bioreactors are glass systems and can be sterilized in an autoclave