Medical biotechnology uses living cells or tissues to produce pharmaceutical products. Biotechnology is the area of research and study of living organisms and their products. It has significant use in our day to day life. With the increasing contagious diseases, the world of biotechnology is successful in producing effective vaccines against these pathogens. They not only cure, but also prevent such infectious diseases. By using plant biotechnology, a plant can increase its tolerance to environmental disturbances like salinity or drought. Red biotechnology is the field of developing pharmaceuticals including vaccines. Green biotechnology is used for the research in agricultural products. Biotechnology gave rise to use of microorganisms in milk and milk products. Bioweapons, which are used to cause diseases and toxins are also included in this field. Animals like pigs, rats, monkeys, cows are used as genetically engineered animals for their use in agriculture or pharmaceuticals.