This document discusses the application of genetic engineering in various sectors. It is used in the pharmaceutical sector to develop vaccines by expressing pathogen genes in microbes and for gene therapy by altering a person's genetic makeup. In agriculture, genetic engineering is applied to crop improvement by increasing frost resistance, delaying fruit ripening, and adding insect and herbicide resistance. Bt cotton and Bt brinjal are examples of genetically engineered foods. Genetic engineering also has industrial applications like using bacteria to artificially produce insulin by recombining the insulin gene into bacterial plasmids.