Google Analytics 4 (GA4) is the newest and most advanced version of Google Analytics, released in 2020. It tracks user behavior through events rather than sessions. With GA4, everyone has access to stream data to BigQuery. It also features enhanced measurement to automatically track additional page interactions without custom configuration. In contrast, Universal Analytics tracks users in sessions, only offers BigQuery access to premium users, and requires additional event tracking for extra page interactions. Reporting is also more customizable in GA4, though specific reports require accessing the analysis tab.