Unique Session
A unique session is a single visit by a user to a website or app within a specific period of time.
Simply put:
One visit to a site by one user
What counts as a session
A session begins when a user:
- enters a website;
- opens an app;
and ends when: - the user leaves;
- a period of inactivity passes (typically ~30 minutes);
- a new day begins (in some systems).
What “unique” means
- one user = one session (within a single visit);
- if the user returns later, that’s a new session;
- one user can generate multiple sessions.
Example
A user:
- visits in the morning → 1 session
- returns in the evening → another session
Total: 2 unique sessions
How it differs from users
- User — a unique individual
- Session — a visit
1 user can have many sessions.
Why this metric matters
It helps to:
- measure traffic;
- analyze user behavior;
- assess engagement;
- build funnels;
- evaluate channel effectiveness.
Related metrics
- Number of users
- Pageviews
- Average session duration
- Bounce rate
Key Takeaway
A unique session is one visit by a user to a website.
This metric shows how often users come and interact with the product.
