Genetically modified organisms, or GMOs, are organisms that have had their DNA altered using genetic engineering techniques. This allows genes from other species to be inserted, giving the organism modified or novel genes. Genetic modification involves inserting or deleting genes, usually from a different species, through techniques like attaching genes to viruses. GMOs are used in research, pharmaceutical production, agriculture, and more. Genetically modified foods specifically have had their DNA altered to produce a new useful trait, such as increased nutrients, pest resistance, or a longer shelf life. Advocates argue GMOs could help address world hunger by producing hardier, more nutritious crops.