Review stars are a visual star rating display, typically shown directly within a search result listing through Review or Aggregate Rating schema markup, giving searchers an immediate, visual trust signal before they even click through to a page.
Listings with review stars generally see meaningfully higher click-through rates compared to standard listings without them, since the visual rating provides quick, compelling social proof directly within the search results.
Google has strict guidelines requiring review star markup to reflect genuine, verifiable customer reviews of the actual product or service featured on that specific page, with misuse resulting in the rich result being disabled.
We implement review star schema compliantly within our Technical SEO service.