Global Privacy Control (GPC)
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Global Privacy Control (GPC) is a browser extension that makes it easy for consumers to set privacy preferences for their personal data. When the setting is enabled, GPC sends a signal to publishers and platforms to let them know they should limit collection of your data.
Specifically, GPC tells websites and apps that you do not consent to the sale or sharing of your data, nor do you want them to use your data without a legitimate business purpose.
As you surf around on the web, you’ll notice an increasing number of companies are starting to honor GPC signals. If you visit these sites with GPC enabled in your browser, they won't sell or share your data without your consent.
It should be noted, however, that websites aren’t legally obligated to honor your privacy preferences when you use the GPC extension.