Yes, Google Analytics 4 (GA4) uses cookies to collect data about website or app usage. GA4 uses cookies to distinguish unique users and sessions, to calculate visitor, session, and campaign data, and to track activity on the site or app. GA4 also uses cookies to store user preferences and data related to advertising and remarketing. 

However, it’s worth noting that cookies are just one of the many ways that GA4 collects data, and Google has stated that it is moving away from relying solely on cookies for data collection. Instead, GA4 uses a combination of cookie data, device identifiers, and other user data to build a more complete picture of user behavior.