Revel is an open-source web framework for Go that emphasizes "convention over configuration." It provides built-in routing, request/response handling, validation, templating, and session management. Similar in philosophy to Rails or Django, but built on Go's concurrency and performance. Revel generates boilerplate code, handles common web tasks, and lets developers focus on business logic. The framework includes a command-line tool for scaffolding projects, hot reload for development, built-in testing support, and integrated logging.