Navigate to your Google Account settings on the web. While you cannot eliminate all ads here without a subscription, you can influence the type and frequency of the ads you see, and you can opt out of the ad personalization that follows you from the main Google search.
Block Ads Across Google Services
Click "Remove" next to any topics that you do not want advertisers to use. This is particularly useful for Android users who find ads integrated into their system interface or within mobile apps.
Go to the "Ad topics" section within your "Data & privacy" settings. Google uses a significant amount of data to personalize the ads you see, but this process relies on the information it collects.
Block Ads Across Google Services
Click on your profile icon and select "Settings. Adjusting Topic Controls Even with ad personalization off, Google allows you to manually manage the topics it thinks are relevant to you.
More About How to switch off google ads
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