Bounce rate is one of the most misunderstood metrics in web analytics. A "bounce" in Google Analytics 4 is a session that is not engaged — meaning the user didn't stay for 10 seconds, didn't trigger a conversion event, and didn't view a second page.
The critical nuance: a high bounce rate isn't inherently bad. A blog post where someone reads the entire article and leaves has a high bounce rate but achieved its goal. A landing page where someone reads and then calls you (without clicking anything on the page) shows as a bounce. Context is everything.
When bounce rate actually matters
Bounce rate is most useful as a diagnostic signal for landing pages with a clear conversion action. If your page exists to get visitors to click a CTA and 85% are bouncing, you have a problem. The question then becomes: is it a relevance problem (wrong traffic), a first impression problem (visitors don't trust the page), or a value proposition problem (visitors don't understand the offer)?
Typical landing page bounce rates: 40-60% is average, under 40% is good, under 25% is excellent, over 70% usually indicates a mismatch between traffic source and page content. Paid traffic landing pages should have lower bounce rates than organic — if they don't, your ad-to-page message match needs work.