Summary  
Node.js is a JavaScript runtime built on Chrome’s V8 engine that executes code outside the browser and uses a non-blocking, event-driven architecture for scalable network applications.

General domain of usage  
Building web servers and server-side applications.

Node.js is a **JavaScript runtime** built on Chrome's V8 JavaScript engine. Unlike traditional JavaScript environments that run in web browsers, Node.js allows you to execute JavaScript code directly on your computer or server, outside of any browser. This means you can use JavaScript to build applications that run on the server side, such as web servers, command-line tools, APIs, and even desktop applications. **Node.js** is especially popular for building scalable network applications because it uses a **non-blocking, event-driven architecture** that can handle many connections at once without slowing down.

**Node.js is commonly used for:**
- Building web servers and server-side applications;
- Creating RESTful APIs for web and mobile apps;
- Developing real-time applications like chat apps and online games;
- Writing command-line utilities and automation scripts;
- Prototyping and rapid application development.

A **"runtime environment"** is a platform that provides everything needed to execute code written in a specific language. **Node.js** is considered a runtime environment because it supplies the engine (`V8`), libraries, and system interfaces required to run JavaScript programs outside the browser.

Definition

Which statement best describes Node.js and its primary use?

Understand how Node.js brings JavaScript to the server side and powers modern web development. Explore its architecture, event loop, and asynchronous behavior, then run real programs and manage modules with CommonJS and ES imports. Gain a solid foundation for building scalable, high-performance applications with Node.js.

Explore how Node.js enables JavaScript to run outside the browser. Understand the differences between Node and client-side JavaScript, examine the V8 engine, and uncover how the event loop powers Node's non-blocking execution model.

Run JavaScript programs directly on your computer using Node's command-line tools. Execute files, experiment with the REPL, and access global variables like process, __dirname, and __filename to build a clear picture of Node's execution environment.

Dive into the architecture that makes Node.js asynchronous and modular. Explore how libuv manages I/O operations and how the module system uses require and ES import syntax to organize and reuse code efficiently.

What Is Node.js?

Awesome!

What Is Node.js?