Google AI Overviews is a summary of the searches performed by users in Google Search. It can be used by over 1 billion users in 100 countries. Although there was a lot of controversy because the summary was hallucinating with incorrect facts and nonsense, Google has made many corrections and in the future there will be an additional summary feature to AI Overviews as well.
This feature is seen as an additional search result to the already generated summary. For example if a user searches for "how to cook al dente pasta?", Google will generate a list of simple cooking methods that the user can select text to copy and so on. This new feature can generate search summaries with AI based on selected text.
According to sources, this early version saw users only able to generate one additional search summary on one AI Overviews. Google seems to really want users to rely on AI-generated summaries of information. Google is also confident that this feature will be accepted by the public until it is ready to display ads. For now it is still uncertain when the AI summary feature to AI Overviews search results will be rolled out to all users.