Some websites use third-party content providers. You can stop third-party content providers from tracking you across websites to advertise products and services.
You can also ask individual websites—and others who provide those sites with content, including advertisers—not to track you.
Prevent third-party content providers from tracking you across websites
Choose Safari > Preferences, click Privacy, then select “Prevent cross-site tracking.”
Unless you visit the third-party content provider, their tracking data is periodically deleted.
Ask websites not to track you
Choose Safari > Preferences, click Privacy, then select “Ask websites not to track me.”
When you visit a website, a request is submitted not to track you, but it’s up to the website to honor this request.