Google Lens is an image and content recognition app developed by Google that attempt to identify the object or read labels and text to retrieves more information from an image and show relevant search results and information. The app not only retrieve information from image, but it also provides services that includes language translation, getting information on products, menu from several restaurants and getting background information on monuments, places and more.
The Google Lens was officially launched on October 4, 2017, while at the time of launch, this app was restricted to only Google Pixel devices. Later on March 5, 2018 Google started rolling out Google Lens to Google Photos on non-pixel devices for both Android and iOS. For Android smartphone users there is a separate app called Google Lens. But, if you are an iPhone or iPad user you either need Google Photos app or Google app installed on your iPhone or iPad because iOS does not have an official Google Lens app, and there is no need to download any third party app for this as well.
Source : https://www.techdotmatrix.com/2018/12/how-to-use-google-lens-on-iphone/