Engagement Rate
In GA4, the percentage of sessions that were engaged, meaning they lasted longer than ten seconds, triggered a key event, or included at least two page views. It replaced the older bounce-based view of quality with a positive signal of meaningful interaction.
Why It Matters
Engagement rate gives a cleaner read on content and landing page quality than raw sessions, because it filters out drive-by visits. Rising engagement usually precedes rising conversions, making it a useful leading indicator for content and UX decisions.
Common Mistake
Comparing GA4 engagement rate directly against Universal Analytics bounce rate as if they are inverses. They are defined differently, so the numbers are not interchangeable and side-by-side comparisons mislead stakeholders.