What happens when introducing a gene into a new organism

Is any organism whose geneticmaterial has been altered using genetic engineering techniques (i. e. geneticallyengineered organism). GMOs are the source of medicines and genetically modified foods and are also widely used in scientific research and to produce other goods. The term GMO is very close to the technical legal term, 'living modified organism', defined in the Cartagena Protocol on Biosafety, which regulates international trade in living GMOs (specifically, "any living organism that possesses a novel combination of genetic material obtained through the use of modern biotechnology").