What is Node.js?
Node.js is an open-source, cross-platform JavaScript runtime environment that allows developers to execute JavaScript code outside of a web browser. It is widely used by developers for building various types of applications, extending JavaScript's utility beyond front-end development. Developers use Node.js to create server-side applications, web applications, and command-line tools. They can build HTTP servers, write tests for their code, and perform file operations like reading and hashing. The environment also supports working with data streams and managing threads for concurrent operations.