This document provides an introduction to genetic modification. It discusses what genetic modification is, who pioneered early work in the field (Gregor Mendel), and some of the potential advantages and disadvantages of genetically modified organisms. Examples are given of genetically modified animals, plants, and foods that have been created, including faster growing salmon, hypoallergenic cow's milk, and glow-in-the-dark pigs. While genetic modification aims to increase yields and make crops more resistant to pests and climate, some argue it can harm the environment and human health. The document concludes by noting the debate around genetic modification.