Understanding how Google Analytics 4 (GA4) follows the sessions is the key to give meaning to your website data. GA4 follows sessions differently from universal analysis, affecting your relationships and ideas.
Let’s explore how GA4 defines the sessions, how traffic sources influence the monitoring of sessions and what they mean for your analyzes.
What are the sessions in GA4?
In GA4, the way a session is classified depends on the origin of the visit. The classification is based on the “source” and “medium” details recorded when someone first accesses your site or application in a new session.
The sessions can be found in GA4 in several different reports, in particular:
- Acquisition overview report.
- User acquisition report.
- Traffic acquisition report.
- Overview of the commitment.
- Report of demographic details.
Dig more deeply: Tools and resources: start with Google Analytics 4
GA4 against UA: Key differences in the monitoring of sessions
In the past, Universal Analytics, a new session has been triggered when a user landed for the first time on the website and the GA tracking code has been activated.
By default, a session ended after 30 minutes of inactivity. All user’s subsequent actions have created a new session. If your website contained videos or content that took more than 30 minutes to consume, you can adjust the duration of the session expiration time.
A new session has also been triggered if the same user has taken an action on the website which created a new source / average trigger. This could happen if they left the website and returned via a different source / support or click an internal link with an UTM parameter.
The main difference between UA and GA4, however, is that a session in GA4 has been “simplified”. It always has a duration of the default session expiration time of 30 minutes, but now the session is only triggered once.
This change improves data accuracy and facilitates understanding – but when comparing the GA4 to UA data, session counts differ.
By decomposing, the following user route would be reported differently:
- 10:00 am: Bob Search on Google for Xyz and click on Xyz.com.
- 10:10 am: After 10 minutes of search, Bob returns to YouTube and sees a pre-roll ad for Xyz.com with a discount, so he clicks on it.
- 10:17 am: Bob registers on the website and receives a welcome email with a reduction code for free delivery, it clicks on it.
- 10:21 am: Bob checks.
In the universal analysis, the three site entries – each of a different source / support – would have triggered three distinct sessions. In GA4, as these actions occurred in the 30 -minute defined session window, they would be considered one session.
Another key difference between UA and GA4 session windows is that a session would automatically expire at midnight in AU. In GA4, however, a session does not express at midnight and can continue the next day.
This means that only one session in GA4 can include several traffic sources. This change affects session volumes and can also have an impact on the allocation.
The sessions are automatically collected. Events collected automatically are the most basic type of GA4 events. They are saved as soon as GA4 follow -up is configured on your website or application, providing essential data without manual configuration or additional configuration.
Dig more deeply: 3 Ga4 ways is much better than UA
Users VS sessions in GA4
In GA4, users and sessions are followed separately, providing different information on website activity.
- User: A unique person who engages with your site. GA4 considers them as an active user.
- Session: A series of interactions within a defined time. A session starts when a user visits and ends when he leaves or becomes inactive.
This means that a user can have several sessions. If the same person visits your website twice in a calendar day, GA4 records it like a user but two sessions.
What is the difference between “committed sessions” and “sessions committed by user”?
This is a common question posed by customers who are used to universal analyzes reporting measures and calculations.
A committed session is defined as a session which meets at least one of the following criteria:
- Lasts a minimum of 10 seconds.
- Includes one or more conversion events.
- Save two or more pages views or screen views.
The sessions incurred per user are the total number of committed sessions divided by the number of users.

This metric appears in the traffic acquisition report as well as the average engagement time by session and the session engagement rate.
The engagement rate is better used alongside the monitoring of key events and other soft and hard measures to assess the quality of the session on the key pages.
Understand glasses
Each GA4 dimension and metric has a specific scope. For example, the “First uses useing channel group” dimension has a user’s range, while the “source / support” dimension has an event range. The combination of dimensions with different glasses can create data shifts and misleading conclusions.
To avoid errors, appear the “first group of user’s default channels” with “First user source / medium”, because both share the same user’s scope.
- Specialized dimensions (For example, the first group of user’s default channels, first source / user support) Associated data in all sessions for a user, offering a wider view of long -term engagement.
- Metrics at the session (for example, sessions) focus on individual session interactions rather than the user.
For specific information:
- Use user -specialized dimensions to analyze long -term user behavior.
- Use specialized metrics to assess individual session performance.
Understand the dimensions of the scope of the session
The dimensions of the range of the session help companies to follow user behavior and to measure marketing performance. They distinguish between new visitors and return and help analyze the effectiveness of marketing strategies.
The standard dimensions of the range of the session include:
- Session of default channels: Categorize traffic by the canal which launched a session. Help marketing specialists to understand what sources are stimulating the most commitment.
- Session: Identifies the marketing channel which started a session, such as organic research, CPC (cost per click) or social media. Helps refine marketing strategies.
- Source of session: Indicates the specific website or platform that has returned a user to the site. Helps to determine which sources stimulate the most precious traffic.
- Session campaign: Follows the marketing campaign that led a user on the site. Help companies to measure and optimize the efficiency of the campaign.
Deeper ideas
Understanding how GA4 follows the sessions is essential for precise relationships and analysis. With its simplified session model, GA4 provides a clearer image of user behavior, although it differs from universal analysis.
By effectively using session data, you can get more in -depth information on traffic sources, commitment and allocation – helping you make more enlightened marketing decisions.
Dig more deeply: How to resolve traffic not attributed in GA4
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