Classic search returns a list of links and leaves the reading to you. You scan the results, pick one, and click through. The page that ranks wins the visit.
AI search does the reading for you. You ask a question and the assistant returns an answer in prose, assembled from sources it retrieved, and often with no click at all. The page that gets lifted and cited wins, and it may never see the visit.
That changes what you optimise for. In classic search the unit is the page and the goal is a rank. In AI search the unit is the passage and the goal is to be the answer, or to be named as its source.
Three things matter more than they used to. Can the engine reach your content at all, which for the AI crawlers means reading it without running JavaScript. Can it find a clean, self contained answer in the page. And does it trust the content enough to repeat it, which comes from clarity and cited sources, not keywords.
Classic ranking still matters, because Google and Bing feed AI answers too. AI search is a new layer on top, not a replacement. Topkay scores both.