Google is testing using AI to generate full search result descriptions and/or AI-summaries of your search result snippet, within the Google Search results.
There are two variations of this; (1) fully replacing your description with an AI-generated version and (2) an AI-generated summary of the search result snippet.
Recently, both Paul Shaprio on X and Brodie Clark on X shared some screenshots of Google displaying AI-generated search result descriptions. They have a little Gemini logo next to them, which symbolizes it was generated using AI.
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