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Instead of embedding JavaScript code directly in an HTML document you can reference an external JavaScript file (with extension .js). This file simply contains all the JavaScript code you want to use. The beauty of including external .js files is that you can make changes in that .js file and the affects will be seen in every HTML page that includes that file. The following code can be used to include a JavaScript (.js) file:

<script type="text/javascript" src="path/folder/yourScript.js">
</script>

This code can be used within the "head" or "body" tags of an HTML page.