What does the do not track button in the internet settings of iphone do?

Urgent! What does the do not track button in the internet settings of iphone do?

How does this relate to makeup? :/

Safari on iOS 7 now has a Do Not Track setting. With Do Not Track enabled, Web sites will be prevented from tracking you via your Web browsing habits, keeping your history private. At least, that's what's supposed to happen.
To enable Do Not Track in iOS 7, launch the Settings app and tap on Safari in the list.
Under the Privacy & Security section you'll find a switch to turn on Do Not Track. Slide it over and you're all set.

BTW what does this have to do with makeup?

Post your question in the right section please.