SQL Noir is a web-based platform that allows users to learn and practice SQL by solving crime-themed mysteries. The platform provides a built-in SQL workspace and a database with clues, and users can earn experience points and level up as they solve cases. The platform is designed for developers, data analysts, and students who want to practice SQL in a hands-on and engaging way. The platform offers a range of cases, from beginner to advanced, and allows users to track their progress and access additional cases with a one-time purchase.