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Home > Frontend Engineering and Javascript > Intermediate Javascript Concepts > Introduction to JS Engines and Runtimes

What is a Runtime?

A runtime is the environment in which a programming language executes. The runtime system facilitates storing functions, variables, and managing memory by using data structures such as queues, heaps, and stacks.

The JavaScript runtime is a program that extends the JavaScript engine and provides additional functionalities, so it can interact with the outside world. Also, the JS runtime provides features/APIs to build Javascript based software. This means both browsers, and JavaScript based frameworks have runtimes, but different ones based on their needs.

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