Key metrics, explained simply
Plain-English definitions of the most important website analytics metrics — sessions, bounce rate, conversion rate, and more — with guidance on what they actually mean for your business.
When you open Google Analytics, you are immediately confronted by numbers and terms that can feel like a foreign language. This guide decodes the most important ones and explains what they actually mean for your business.
Quick summary
The metrics that matter most for most businesses are: users (how many people visited), sessions (how many visits), engagement rate (are people engaging?), and conversions (are people taking the action you want?). Everything else provides context.
Users
A user is a person (or more precisely, a browser/device) that visited your website. If the same person visits on Monday and again on Friday, they count as one user but two sessions.
What it tells you: Your overall audience size. Is your reach growing?
Sessions
A session is a single visit to your website. One user can have multiple sessions. A session starts when someone arrives and ends when they leave or have been inactive for 30 minutes.
What it tells you: How often people are visiting — not just how many people.
Pageviews (now called "Views" in GA4)
A view (or pageview) is recorded every time any page on your site is loaded. If one visitor reads five pages in a single visit, that is five views.
What it tells you: Which content is being read and how actively people are browsing.
Engagement rate
Engagement rate measures the percentage of sessions where the visitor was genuinely engaged — meaning they stayed for more than 10 seconds, visited more than one page, or completed a conversion event.
What it tells you: Are people actually interested in your content, or are they landing and leaving immediately?
Engagement rate replaced bounce rate in GA4
In the old version of Google Analytics (Universal Analytics), the key metric was "bounce rate" — the percentage of visitors who left without clicking anything. GA4 flipped this to "engagement rate," which is more positive. A high engagement rate (above 50%) is good.
Bounce rate
Bounce rate is the opposite of engagement rate — it is the percentage of sessions where the visitor left without engaging. A high bounce rate is not always a problem. If someone finds your phone number and calls you, they may "bounce" but they converted perfectly.
What it tells you: Context-dependent. High bounce on a key service page may need attention. High bounce on a contact page is fine.
Average engagement time
This is how long, on average, visitors spend actively engaging with your site per session.
What it tells you: Are people reading or just scanning? A blog post with an average engagement time of under 30 seconds is probably not being read.
Conversion rate
A conversion is a specific action you want visitors to take — filling in a form, making a purchase, clicking a phone number link. The conversion rate is the percentage of sessions that result in a conversion.
What it tells you: Is your website actually working? This is the single most important business metric.
Traffic source / channel
This tells you how visitors found your site. Common channels include:
| Channel | What it means |
|---|---|
| Organic Search | Found you on Google (or another search engine) |
| Direct | Typed your URL directly or used a bookmark |
| Referral | Clicked a link on another website |
| Social | Came from a social media platform |
| Clicked a link in an email | |
| Paid Search | Clicked a Google Ads result |
New vs returning users
- New users — visiting your site for the first time (on that device/browser)
- Returning users — have visited before
What it tells you: How many people are discovering you vs. how many loyal visitors you have.
Easy to miss
These numbers are estimates, not exact counts. Privacy settings, ad blockers, and browser restrictions mean some visits are not captured at all. Treat all analytics data as directional — use it for trends and comparisons, not as a census.
Common questions
Related guides
- Users vs sessions vs views
- Engagement, bounce & time on page
- Conversions & goals explained
- Vanity metrics vs meaningful metrics
- Understanding your monthly report
Need a hand?
Learn more
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Users vs sessions vs views
A clear, jargon-free explanation of three easily confused analytics numbers — users, sessions, and views — and what each one tells you about your website.