CCPA Stands for "California Consumer Privacy Act"
According to the office of the Attorney General: "The California Consumer Privacy Act of 2018 (CCPA) gives consumers more control over the personal information that businesses collect about them" https://oag.ca.gov/privacy/ccpa
When Adding Adsense to your website, and even other services from Google like Analytics, etc, Google keeps a lot of information from the users, and this information they use it to gneerate better targetted products for their clients, like ads. And in many times this data is also sold so that other companies can as well use it for marketing purposes.
Google Adsense gives you the choice to add a warning message where visitors can opt-out from sharing their information with 3rd parties.
Whe you activate the switch, Google will show a disclaimer at the bottom of your page that says "Do Not Sell My Personal Information", then if the user clicks on it, a message like this appears:
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