When two or more different pieces of DNA from different organisms are combined it is known as Genetic Engineering. It is also known as Recombinant DNA technology. Genetic Engineering has many uses in modern science. It is prominently used in medicine and agriculture. The Insulin used today by Diabetic patients is a gift of Recombinant DNA technology. The technology is also used in the production of various vaccines and gene therapies. In agriculture, genetically modified plants are made with the aid of this technology. Diagnostic tests and procedures are sometimes based on genetic engineering. You can go to Vedantu, to learn more about the steps involved in Recombinant DNA technology.