How to use $ in jQuery to avoid conflicts with other libraries

In Jquery, $ is an alias of JQuery. All places where $ is used can also be replaced by JQuery. For example, $('#msg') is equivalent to JQuery('#msg'). However, when we introduce multiple js libraries and the $ symbol is also defined in another js library, then there will be a conflict when we use the $ symbol. The following is an example of introducing two library files jquery.js and prototype.js.
The first case: jquery.js is introduced after prototype.js, such as:

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How to use $ in jQuery to avoid conflicts with other libraries_jquery