The Ray Distributed Debugger is a powerful tool designed to streamline debugging for Ray open source users, offering an interactive debugging experience with Visual Studio Code and Ray >= 2.9.1, allowing users to set breakpoints anywhere in their Ray cluster, post-mortem debugging of tasks that fail with unhandled exceptions, and seamless debugging with VSCode just like local development. To use the debugger, users need to create a new virtual environment, install dependencies, start a Ray Cluster, register clusters, add the RAY_DEBUG environment variable, set up the local folder, run their Ray application, attach to paused tasks, and use the VSCode Debugger. This tool empowers developers to debug distributed systems more efficiently, saving time and effort in their development workflow.