If you have a i-Device, open up your photos app and look at the search icon on the bottom right (at least on my iPhone). Upon click it, you'll see a prompt to search for <Photos, People, Place...>. Go ahead and search for something. On same i-Device, from the home screen, swipe down, and start typing something --- results show up nearly instantly. The fact that you can search for these things is a result from your phone scanning your content and semantically tagging it. This is all built into iOS.