🧠Tier 4 - Advanced / NicheID: crossDeviceTracking
Cross-Device Tracking
Stitching user journeys across mobile, tablet, and desktop
In Simple Words (Zero Jargon):
Stitching user journeys across mobile, tablet, and desktop
Why It Is Critical
Cross-device tracking unifies interactions across devices so a user who discovers an ad on mobile and completes purchase on laptop is counted as 1 single user journey rather than 2 disjointed visitors. GA4 prioritizes User ID (logged-in), Google Signals, and Device ID cookies.
What You Get: Accurate user journey visibility across devices - essential for businesses where users browse on mobile but convert on desktop.