tsx is a blazing-fast TypeScript executor and REPL for Node.js. It allows you to run TypeScript files directly without pre-compilation, improving developer experience. Supporting modern ES modules syntax and features from the latest TypeScript versions, tsx removes the need for ts-node in many cases. It facilitates quicker prototyping, testing, and script execution in TypeScript-based projects. Its simplicity and performance make it a valuable tool in any TypeScript developer's arsenal.