1. Rainer, a Korean company, has secured 9th place in a global ranking of popular AI services, standing out as the only domestic web service in the top 10; 2. In the AI search service category, Rainer ranks second, following Purpleplexity; 3. These AI search services are known for providing personalized and up-to-date information by accurately understanding user intent, posing a challenge to traditional search engines like Google.