GA4 Advanced Tracking is the practice of capturing, structuring, and analyzing user events (clicks, form submissions, purchases, custom interactions) in Google Analytics 4. Instead of tracking only pageviews, advanced tracking captures every meaningful user action, along with context (user properties, event properties, device, location) to enable detailed funnel analysis, audience segmentation, and conversion optimization. Google Tag Manager (GTM) is the tool that implements this—a tag management system that lets you fire events to GA4 without code changes. Together, GA4 + GTM form the backbone of most analytics stacks.