A session is one visit to your website. It bundles together everything a visitor does, from the page they land on to the last action they take, all within a single window of time. Most of your analytics reports are built on sessions, so a wrong session count throws off a lot of other numbers.
What is a session?
When someone arrives on your site, your analytics tool opens a session for them. Every page they view and every action they take after that belongs to the same session. It stays open while they keep browsing and closes when they leave or go quiet for a while, commonly 30 minutes of inactivity.
Come back tomorrow and that's a new session. So one person can rack up many sessions over days or weeks, which is how analytics tells the difference between a returning visitor and a fresh one.
Why sessions matter
A lot of the numbers you check every week are different views of session data:
- Traffic and visits are counted as sessions.
- Bounce rate and average session duration are measured per session.
- Funnels and conversion paths follow what happens inside a session.
Because so much sits on top of it, a miscounted session ripples outward. If the count is wrong, the rate, the duration, and the funnelRepresents the step-by-step process users take before completing a conversion, such as making a purchase or signing up. built on it are all wrong too.
How cross-domain splits a session in two
One way sessions get miscounted is at a domain boundary. If your site spans more than one domain and a visitor crosses from one to the other, analytics often ends the first session and starts a second. One person browsing your marketing site and then your checkout on a separate domain gets recorded as two visitors in two sessions. The visit was continuous, but the report shows a clean break right where they crossed over.
This is the cross-domain tracking problem. It inflates your visitor counts, drags down your average session duration, and snaps your funnels in half. It's also what produces a self-referral, where your own domain shows up as the source of the second session.
How Conversion Bridge Helps
Conversion Bridge helps keep a visit counted as one visit. For Google Analytics 4, it can turn on cross-domain trackingA method of tracking user behavior as they move between two or more different domains, allowing website owners to maintain a consistent user journey across multiple properties. so a visitor stays in a single GA4 session as they move between the domains you own, instead of splitting into two at the boundary. On top of that, its conversion journeys record the full page-by-page path a visitor took before converting, so you see the whole visit rather than one isolated page.
Frequently Asked Questions
How long does a session last?
It depends on the tool, but a session usually ends after about 30 minutes of inactivity. Returning later starts a new session.
What's the difference between a visitor and a session?
A visitor is a person; a session is one of their visits. The same visitor can have several sessions across different days.
Why is one visit showing up as two sessions?
Usually because your site spans more than one domain and cross-domain tracking isn't set up, so the visit splits at the point where the visitor crosses from one domain to the other.