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rich snippet
In short and in plain language
A rich snippet is a search result with extra details.
Next to the title and description it shows things like stars, prices or dates.
It is based on structured data on the page. The search engine decides for itself whether to use it.
Definition
A rich snippet is an enhanced search result that shows extras such as stars, prices or dates next to title and description. It is based on structured data on the page. Whether the search engine actually uses this display is its own decision.