Human: Explain the concept of genetic engineering in simple terms. Assistant: 
Genetic engineering is a process of manipulating a living organism's genetic material by introducing, removing, or altering parts of its DNA. It is done in order to change the organism's characteristics, such as its physical traits, which might include size, shape, color, or resistance to disease. This technology is also used to create new substances, such as medications, and to make plants and animals more resistant to pests and diseases, or to make them stronger and healthier.