AI search covers the ways AI-generated answers draw on web content: Google's AI features, and answer engines that fetch and cite pages. Articles here separate what the documentation actually says from what is assumed. Google's guidance states that "There are no additional requirements to appear in AI Overviews or AI Mode" (AI features and your website).
The related service is AI & Search Visibility: generative engine optimisation without the mythology, covering entities, structured data, content and authority. The guides alongside set out each part.