NodeJS is an open-source, cross-platform JavaScript runtime environment that allows developers to create server-side applications. It offers developers an event-driven architecture and non-blocking I/O APIs, making it suitable for developing real-time applications such as chat apps, games, and collaborative tools. NodeJS has become one of the most popular technologies for web app development due to its wide range of features and capabilities.

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When asking whether NodeJS is a language, the answer is not a straightforward yes or no. NodeJS is an environment where code can be written using JavaScript, however it does not have its own syntax and does not provide any additional features beyond what JavaScript already provides.

NodeJS provides developers with a platform to develop server-side applications through several APIs that allow them to interact with the operating system and perform various tasks. In addition to these APIs, NodeJS includes modules like Express and for additional functionality for web applications.

The main benefit of NodeJS is that it allows developers to use the same language (JavaScript) on both the client side and the server side, which makes it easier for developers to write code that can be shared between the browser and the server without having to learn different languages or frameworks.

When comparing NodeJS with other languages there are a few key differences worth noting. Most other languages are compiled whereas NodeJS is interpreted, meaning it must first be parsed before being executed by the computer whereas compiled languages are converted directly into machine code which can be run immediately. Additionally, NodeJS uses non-blocking I/O APIs which helps improve performance in high traffic environments.

While NodeJS is not technically a language, it does provide developers with a powerful platform for developing server-side applications using JavaScript. Its use of non-blocking I/O APIs makes it ideal for high traffic applications while its ability to share code between client side and server side makes it easy for developers to work with both without having to learn different languages or frameworks.