What are JavaScript modules, and why are they useful?

The question is about JavaScript

Answer:

JavaScript modules allow developers to break down their code into reusable, self-contained units. Modules, starting in ES6, now enable developers to organize code in smaller-sized files which can be imported and exported according to need, giving modularity and even maintainability. This reduces the chance of naming collision and, moreover, makes the management of large codebases easier because dependencies are well-defined.

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