Click “Personal” and search returns results from your personal information that match the search string you used for the initial search. Google’s personal search finds items that are not stored on the device where you’re carrying out the search. I also found a recent picture of my wife, labeled it with her name, and then did a personal search with her name. The personal search results are accompanied by ads. Unlike Google’s regular search results, the ads appear at the bottom of the page rather than the top.

Source: Forbes May 31, 2017 09:56 UTC