What is Google Analytics 4 (GA4)?

What Is Google Analytics 4?

Google Analytics 4, commonly called GA4, is Google’s current analytics platform. It replaced Universal Analytics in July 2023 and uses a fundamentally different data model built around events rather than sessions and pageviews.

GA4 tracks user interactions as events. A pageview, button click, scroll, video play, purchase, and file download are all events. This model provides more flexibility and better cross-platform measurement across websites and mobile apps.

GA4 vs Universal Analytics

Factor	Universal Analytics	Google Analytics 4
Data model	Session-based, pageview-centric	Event-based
Cross-platform	Separate properties for web and app	Single property for web and app
User identification	Client ID only	Client ID plus User ID and Google signals
Reporting interface	Pre-built reports	Exploration reports and custom dashboards
Machine learning	Limited	Built-in predictive metrics
Data retention	Up to 26 months	2 or 14 months for user-level data
Sampling	More common	Less sampling with standard reports
Cookie dependency	Heavy	Designed for a cookieless future

Key GA4 Concepts

Events

Everything in GA4 is an event. Events fall into four categories:

Category	Description	Examples
Automatically collected events	Tracked without setup	page_view, session_start, first_visit
Enhanced measurement events	Tracked when enabled	scroll, outbound_click, site_search, video_engagement
Recommended events	Predefined for common use cases	sign_up, purchase, generate_lead, share
Custom events	Created for your specific needs	download_whitepaper, play_demo, toggle_pricing

Conversions

In GA4, conversions are events you mark as important. Any event can become a conversion, giving you flexibility beyond the old goal system.

Audiences

Audiences are groups of users defined by behavior, demographics, or attributes. GA4 audiences update in real time and can be shared with Google Ads.

Exploration Reports

Explorations let you build custom analyses using techniques like:

• Free-form exploration
• Funnel exploration
• Path exploration
• Segment overlap
• Cohort exploration

Why SEOs Use GA4

Track Organic Traffic

GA4 breaks down traffic by source and medium, showing how much traffic comes from organic search. SEOs monitor organic sessions, engaged sessions, and key events from search traffic.

Measure Content Performance

The Pages and screens report shows which pages attract the most views, engagement, and conversions. This helps identify top-performing content and content that needs improvement.

Understand User Engagement

GA4 introduces engagement metrics that go beyond bounce rate:

Metric	What It Measures
Engaged sessions	Sessions lasting 10+ seconds, with 2+ events, or including a conversion
Engagement rate	Percentage of sessions that are engaged
Average engagement time	Time users actively spend on your site
Events per session	Average number of events in a session

Cross-Platform Tracking

For businesses with websites and mobile apps, GA4 provides unified reporting across platforms in a single property.

Predictive Metrics

GA4 uses machine learning to estimate:

• Purchase probability
• Churn probability
• Predicted revenue

These metrics are available when enough data exists and can guide remarketing and content strategy.

Key GA4 Reports for SEO

Report	What It Shows
Traffic acquisition	Sessions and engagement by source and medium
Pages and screens	Performance of individual pages
Landing page report	Where organic traffic enters your site
Events	All tracked interactions
Conversions	Which events drive business outcomes
Demographics	User location, device, language, and interests
Search console linking	Combined GA4 and Search Console data

Linking GA4 to Google Search Console

Connecting GA4 with Google Search Console combines ranking data with on-site behavior. This integration shows:

• Which queries bring traffic to specific landing pages
• How organic visitors engage after arriving
• Which pages have high impressions but low engagement

To set it up, go to Admin > Product links > Search Console links in GA4.

Common GA4 Mistakes

Treating GA4 Like Universal Analytics

GA4 is not a direct replacement with the same reports. SEOs need to learn the event model and build new reporting habits.

Ignoring Event Tracking Setup

GA4 collects basic data automatically, but meaningful SEO and conversion insights require a deliberate event measurement plan.

Not Defining Conversions

Without marking key events as conversions, GA4 cannot show which traffic sources and pages drive business results.

Poor Data Retention Settings

User-level data in GA4 expires after 2 or 14 months depending on settings. For long-term analysis, export data to BigQuery or Looker Studio.

Best Practices

• Define a clear event and conversion strategy before implementation
• Link GA4 to Google Search Console for combined SEO insights
• Set up custom exploration reports for your specific KPIs
• Use BigQuery export for long-term data storage
• Regularly audit events to ensure clean, accurate data
• Train stakeholders on GA4’s different reporting model

Frequently Asked Questions

Is Universal Analytics still available?

No. Google sunset Universal Analytics in July 2023. All standard properties stopped processing data, and users were required to migrate to GA4.

Is GA4 free?

Yes, the standard version of GA4 is free. GA4 360 is the paid enterprise version with higher limits and support.

Can GA4 track keywords?

GA4 does not show organic search keywords directly due to privacy restrictions. Linking Google Search Console is the best way to see query data alongside GA4 behavior metrics.

What is engagement rate in GA4?

Engagement rate is the percentage of sessions that qualify as engaged. An engaged session lasts longer than 10 seconds, contains two or more events, or includes at least one conversion.

Summary

Google Analytics 4 is the standard for modern web and app analytics. Its event-based model, cross-platform capabilities, and predictive insights make it essential for SEOs and marketers. Learning GA4 thoroughly unlocks better understanding of organic traffic, content performance, and user behavior.