This Practice Note provides a summary of UK law as it applies to the use of deepfakes. A deepfake is a form of synthetic media in which existing media such as a video clip and a series of photographs are combined together using artificial intelligence to create a realistic but fake video. The Practice Note covers: what a deepfake is, how deepfakes work, harmful uses and applications of deepfakes, such as for entertainment, parody and political satire and healthcare. It also looks at the application of UK law to deepfakes, what social media platforms and search engines are doing to counter the issues created by deepfakes and future technological controls including problem areas concerning technological and legislative or common law controls.