1. What is Node.js?Node.js is an open-source, cross-platform JavaScript runtime environment built on the Chrome V8 JavaScript engine. Traditionally, JavaScript was only executed in web browsers, but with Node.js, JavaScript can now run on servers as well.2. Key Features of Node.js2.1. Single-Threaded Event LoopNode.js operates on a single-threaded model but uses an event loop and asynchronous I/..