What is a Runtime Environment / a Run-time Library?
Javascript, Node, Runtime

The runtime environment is a category for a library of functions, which every computing language has, that operates during the runtime of the program.

You could call it simply a library. It is a library of functions. However these special 'runtime' functions are necessary for the program to work properly while it is running. 

Node.js is an example of a runtime environment. It is a javascript runtime environment designed for servers to serve and communicate over a network (beziehungsweise the world wide web, via HTTP). 

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