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From the glossary

Google Analytics 4 (GA4)

GA4 is Google's free website analytics tool that tracks who visits your site, what they do, and whether they take actions that matter to your business.

Links and details verified as of September 22, 2026. Ad platforms change constantly — see something outdated? Tell us and a human will fix it.

What it is

Google Analytics 4 is a free tracking platform that records every visit to your website — where visitors came from, which pages they viewed, how long they stayed, and whether they completed key actions like a purchase or form submission. You install a small snippet of code (or use Google Tag Manager) once, and GA4 collects data automatically from that point forward.

GA4 replaced the older Universal Analytics in 2023. It organizes everything around “events” (clicks, scrolls, form fills) instead of the old pageview model, which makes it more flexible — but also more confusing out of the box.

Why it matters for your ads

When you run paid ads, you’re spending real money to send people to your website. GA4 tells you what those people actually do after they click — so you can tell whether your ad spend is working or being wasted on visitors who bounce immediately.

GA4 also feeds data back into Google Ads when linked, letting the platform automatically optimize your campaigns toward people who are most likely to convert. Without it, Google is flying blind with your budget.

Set it up

  1. Go to analytics.google.com and sign in with the Google account you use for your business.
  2. Click 'Start measuring,' name your account (your business name), then name your property (your website name) and select your time zone and currency.
  3. Choose 'Web' as your platform, enter your website URL, and click 'Create stream' — this generates your Measurement ID (format: G-XXXXXXXXXX).
  4. Install the tracking code: paste the provided Google tag snippet into the <head> of every page on your site, or add it via Google Tag Manager if you use that.
  5. Wait 24–48 hours, then go to Reports → Realtime in GA4 and open your website in another tab — you should see yourself appear as an active user to confirm tracking is live.
  6. Link GA4 to your Google Ads account: in GA4 go to Admin → Google Ads Links → Link, select your Ads account, and enable personalized advertising.

Watch out for

  • GA4 only collects data from the day you install it — it cannot show you historical traffic from before setup, so install it before you launch any ads.
  • The Realtime report is the only way to verify your tag is working immediately; the standard reports have a 24–48 hour data delay.
  • GA4 does not automatically track form submissions or purchases as conversions — you must configure those specific events as 'Key events' (formerly called conversions) manually.
  • Linking GA4 to Google Ads is a separate step that many beginners skip; without it, your ad campaigns won't benefit from GA4's audience and conversion data.

Open Google Analytics ↗ https://analytics.google.com

Now put it to work. Every recipe in the cookbook uses terms like this in real campaign setups — find your industry and follow the steps.