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After more than 13 years, and tens of thousands of questions, Moz Q&A closed on 12th December 2024. Whilst we’re not completely removing the content - many posts will still be possible to view - we have locked both new posts and new replies. More details here.
The voting is part of the website shown in the SERP. Just think of a SERP showing some products including an amazon offer. Amazon added the information from their customers product reviews using rich data etc. Google uses this rich data information to display these stars.
But however, not all sites using rich data snippets get those stars.