Sitecore Search is an AI-driven, headless content and product discovery platform designed to create predictive and personalized search experiences.
Majority of web application require a search tool to achieve content search - customers who purchase both XM Cloud and Search must integrate the two products to enable them to leverage Search in the sites built out using XM Cloud.
Search experience are available OOTB that allows you to get a simple search experience up and running in SitecoreAI. Read more on the Get started with search experience documentation.