Definition - What does Private Browsing mean?
Private browsing is a privacy feature present in some Web browsers that disables Web cache, cookies, browsing history or any other tracking feature that the browser may have. This allows the user to browse the Web without leaving traces such as local data that can later be retrieved. One major feature of private browsing is disabling data storage through cookies, which is a way for websites to track and record a user's activities.
Private browsing is also known as privacy mode or incognito mode.
Techopedia explains Private Browsing
Private browsing is a mode where all the privacy features of the Web browser are activated without having to manually set them individually, such as setting cookies to off and clearing the browsing history. When using private browsing mode none of this data is stored. It became widely available in May 2005, when it was included in the Safari Browser which came with Mac OS X Tiger.