Check out example codes for "jquery $ is not defined". It will help you in understanding the concepts better.

Code Example 1

<script src="" type="text/javascript"></script>

Code Example 2

<!--If that error occurs, you need to include Jquery in the HTML-->
<script src=""></script>

Code Example 3

This type of error arise when the jquery library file is not included properly in HTML file.
or if its included then might be the chances of file path error for that you need to cross verify the file path.

Here is the direct solution that you copy below path and paste in your HTML document.
<script src=""></script>

I hope it will help you.
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Code Example 4

/*If this error occurs, include Jquery code in the HTML,
add jQuery code in footer i.e. just before the closing </body> tag. If you have not done that, then use the defer attribute. */
<script src=""></script>

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