Node.js is a popular JavaScript runtime that provides a fast and scalable platform for building modern, server-side web applications. The document discusses Node.js's growth and backing by major companies. It outlines how Node.js can improve performance, customer experience, and productivity for enterprises. Node.js handles high concurrency well due to its event-driven and non-blocking model. Case studies show how companies like Netflix, PayPal and Groupon saw benefits from Node.js. The appendix provides a directory of Node.js enterprise services and tools.