As you search on Google's search engine, Google collects information on what you search for and assumes this is your interests making it easy for them to target ads for you.
It's not as hard as you might think.
When you open your "Ad personalization" page you will see this image:
Toward the bottom of this window you will see "Ad personalization is ON". You would think turning this off would stop Google from gathering information, BUT this window opens telling you what happens when you turn this setting off:
There is another setting towards the bottom of the "Ad personalization" page, "Advanced" with a down arrow. Clicking it gives yet another option:
Unchecking this shows this pop-up:
Basically Google is telling you there is no way to stop the ads.
Back to your "Ad personalization" page, just before the information they have collected you will see "Learn how to control the ads you see" which is yet another way to controlling ads.
Conclusion: Google is going to serve ads to you.
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