Monk is a minimalist web framework for Go inspired by Sinatra (Ruby) and Flask (Python). It provides HTTP routing, middleware support, and JSON helpers on top of Go's standard library. Monk code is concise and expressive while maintaining Go's speed (compiled, no GC pauses). A Monk app is typically 50-200 lines for a full microservice. It's not an opinionated framework; you choose databases, auth, deployment.