Biotechnology has great importance in our life. The understanding of technologies based on biological processes has made us easy to solve different biological problems. Different diseases can be made curable only with the understanding of molecular reason behind the disease. Different biological processes can be solved only with the help of bio technologies. As for example how to increase the production of agricultural products, how to treat disease resistant to pesticides, how to controls bio hazards etc. Though Biotechnology is the branch of biochemistry, it is a applied field.