The token is a special syntax through which you can dynamically retrieve the values.

The dynamic content token allows you to retrieve the data from different types such as ACF, Post, User, Term, Option, and much more. If you want to know various tokens that you can use then you can use this widget.
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This widget is useful to understand a multitude of tokens available on your site so that you can better understand how tokens work and see results based on your own data.
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The results of this widget are only visible to administrators.

Select the Type you want to see Tokens for and they will be populated in the data table as shown in the below screenshot.