https://www.cnet.com/news/google-lens-is-directly-integrated-in-googles-pixel-3/

Google Lens is a visual search tool that uses your phone's camera to let you find more information on real world objects. Google first announced the tool two years ago, and initially released it last year, exclusively with the Pixel 2 phone.

Lens isn't an app, but a tool Google is embedding into its other services. For example, in Google Maps, you can use Lens to help orient you while using walking navigation. Google Lens also lets you point your phone at a book to see background on the author, along with reviews and info on where to buy it. Point Lens at a storefront, and you'll see business information and reviews. Point it at a flower, and you can tell what species it is.