What is DNA extraction used for

DNA is very valuable. It helps farmers in agriculture in genetic modification of plants such that the plants would have the good characteristics such as being more resistible to diseases.Also genetic engineering of animals such that the animals that are produced have qualities such as leaner meat. Also in Taiwan, pigs can glow in the dark because of genetic engineering. It helps in manufacturing of pharmaceuticals and also to diagnose patients through genetic testing. For forensic use to identify evidence left behind by the criminal and to identify the dead.