How does your phone know who is in a photo? How does Instagram decide which video to show you next? And how can ChatGPT have a conversation with you? For applications like these, we do not program every rule in advance. Instead, we let computers learn patterns from examples. This is called machine learning. In this mini lecture, you will discover how this learning process works, how it forms the basis for AI that can generate new text and images, and why such systems can make mistakes.