Welcome to the backend

You've been talking to a server all along

In the iOS course you built the PawWalk app. Every screen you made — the walker list, the booking form, login — worked by asking a server for data over HTTP. That server is exactly what this course teaches you to build: the other side of the URL. (Started here without doing the iOS course first? That's fine — this course assumes zero Python and explains the app side as it goes.)

By the graduation module you'll understand — and have typed — the pieces of a complete Python backend: routes, validation, a real database, authentication, payments, tests, and an AI assistant that uses an LLM and RAG to answer questions about PawWalk.