What is Google Analytics? What does GA4 measure?

プログラミング・Web開発カテゴリを表すパンダのイラスト Programming / Web Development

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Google Analytics 4 (GA4) is a service that measures and analyzes user behavior on websites and apps with an event-centric approach. Based on official Google information, this is organized for beginners from a practical perspective.

Information verification date: 2026-09-19

Conclusion first

Google Analytics 4 (GA4) is a service that measures and analyzes user behavior on websites and apps with an event-centric approach.

PerspectiveCheck points
Main objectiveGoogle Analytics 4 (GA4) is a service that measures and analyzes user behavior on websites and apps with an event-centric approach
General userUnderstand basic usage and interface screens
IT administratorVerify permissions, data, contracts, and audits
DeveloperVerify APIs, SDKs, tags, and other technical elements against official specifications
ComparisonReview role differences compared to web/app analytics
flowchart LR
 U[利用者] --> S[Googleサービス]
 A[管理者] --> S
 S --> D[データ / 設定]
 Dev[開発者] --> I[API / SDK / タグ]
 I --> S

Position within Google

Google offers different services for advertisers, publishers, analytics, search management, and developers. First, verify 'who manages what' rather than relying solely on names.

Perspective of general users and administrative staff

Verify basic functions using official screens and test data. For advertising and analytics, understand the meanings of metrics, data sources, and measurement periods separately.

Perspective of IT administrators

Check users, administrators, permissions, external sharing, contracts, auditing, and external integrations. Assume that integrated services also have distinct permissions and configurations.

Perspective of developers and automation

If APIs or tags are present, check official documentation for Cloud Project requirements, authentication, OAuth scopes, rate limits, and billing. Do not store actual email addresses, customer IDs, Measurement IDs, tokens, API keys, or client secrets in public code repositories.

Comparison with web and app analytics

Associating this with web and app analytics can help you grasp the entry point, but there is no one-to-one mapping. Compare roles by aligning functions such as the advertiser, publisher, measurement entity, and search engine.

Safe experimentation

  1. Check current terms of service on official pages.

  2. Use test or dummy data.

  3. Start with read-only access or previews.

  4. Double-check the target, cost, and scope before executing billing or publishing operations.

  5. Verify APIs and tags in a staging environment.

Success criteriaEnsure that only the intended targets are displayed, measured, and managed, with no unintended exposure, billing, or permission grants.

Security and privacy

  • Use the principle of least privilege.

  • Do not include personal information or internal identifiers in public examples.

  • Do not store credentials in GitHub.

  • Verify consent and privacy requirements for advertising and analytics.

  • Check the budget and billing details for paid services.

Official Information

What should you do next?

Determine whether you are a user, IT administrator, developer, advertiser, or publisher, and test only the screens and permissions required for that role.

GA4 records user behavior using 'events'.

In GA4, you can measure not only page views but also interactions and occurrences such as link clicks, completed purchases, and app crashes as events. Beginners will find it easier to understand if they view it not just as a 'tool for viewing traffic', but as an 'infrastructure for analyzing what happened on a site or app using events'.

What to check first in practical work

  1. Define what constitutes a conversion or success metric.

  2. Verify which event captures that action.

  3. Confirm data transmission using verification tools such as DebugView before proceeding to report evaluation.

Additional Official Google Information

Article-specific reassessment: GA4 measures based on events.

Google Analytics 4 measures web and app usage focusing primarily on events and parameters. It is important not to confuse layers such as properties, data streams, events, users/sessions, and conversions/key events.

Papanda TRY: Visualizing Fictional GA4 Events

The Daily Code candidate is page_view、scroll、click HTML that displays dummy JSON in the browser timeline. Next, we aggregate the counts by event name using PowerShell, using the same data viewed from two directions: "screen display" and "aggregation" as educational material.

What kind of service is it, really?

Google Analytics 4 (GA4) is a service that measures and analyzes user behavior on websites and applications primarily through events.

The differences from similar services are easier to understand when organized by "who the service is for and what data or settings it handles."

Document information

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What is Google Analytics? What does GA4 measure?
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https://papanda925.com/?p=17473&lang=en

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