Google Lens is an image recognition mobile app developed by Google. It is the search giant’s new method for recognizing content in your photos, and making information available to you. It offers language translations, reviews and menus for restaurants, gibes background information on monuments and landmarks. It was first announced during Google I/O 2017.

How to Use Google Lens
Take a photo of the desired object
Open Google Photos app
Navigate to the picture
Tap the Google Lens icon at the bottom of the screen, before the trash icon.
After carrying out these steps, Google lens will provide information based on what the photos are about using Artificial Intelligence, based on the probability that Google lens understands the content of the picture you took.

Source:
https://rnscope45.com/technology/phones/how-to-use-google-lens/