Node.js is an open-source cross-platform runtime environment that executes JavaScript code outside of a web browser. It is capable of handling a huge number of simultaneous connections with high throughput via non-blocking I/O and a single-threaded event loop. This means that Node.js based server does not wait for an API to return data like traditional web-servicing techniques but moves on to the next request. When the API has returned data, the server goes back to that request and returns the content to the client. In addition, Node.js is built on Chrome’s high-performance V8 JavaScript engine which makes code execution very fast.

Node.js is mainly used for developing server-side and networking applications. As it is capable of handling tens of thousands of concurrent connections, it is great for developing fast and scalable network applications.

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