Third-party JavaScript libraries are those that are not directly included with JavaScript, but they serve a similar purpose: they enable you to do complicated things with only a small amount of code because that small amount of code refers to something bigger under the hood that someone else has already created. In other words, you can avoid reinventing the wheel by leveraging existing code that exists elsewhere. Using a third-party JavaScript library is usually as simple as copying one or more files to your server (or linking to an external but incredibly stable location) and including a <script> tag in your document to load the library, thus making its code available to your own scripts.
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