Private Browsing protects your private information and blocks some websites from tracking your search behaviour. Safari won't remember the pages you visit, your search history or your AutoFill information.
Turn on Private Browsing
On your iPhone, iPad or iPod touch, open Safari, then tap 
. Tap Private, then tap Done.
Turn off Private Browsing
On an iPhone, iPad or iPod touch, open Safari, then tap . Tap Private, then tap Done.
While Private Browsing is on, Safari appears black or dark instead of white or grey.