Explore Ruby's new debugging functionality in this RubyConf 2021 talk by Koichi Sasada. Discover the advantages of ruby/debug, a completely rewritten debugger for Ruby 3.1, including its speed, remote debugging capabilities, native VSCode integration, and support for threads and Ractors. Learn about basic and advanced features through live demonstrations, such as setting breakpoints, controlling the debugger from within programs, and step-by-step execution. Gain insights into seamless integration with VSCode and Chrome browser, postmortem debugging of dead Ruby processes, and record-and-replay debugging with backward stepping execution. Understand the performance improvements and acknowledge the contributors behind this powerful new tool for Ruby development.