Google Photos uses the domain of computer vision.
Explanation:-
Computer Vision, abbreviated as CV, is a domain of AI that depicts the capability of a machine to get and analyze visual information and afterward predict some decisions about it. The entire process involves image acquiring, screening, analyzing, identifying, and extracting information. This extensive processing helps computers to understand any visual content and act on it accordingly. In computer vision, Input to machines can be photographs, videos, and pictures from thermal or infrared sensors, indicators, and different sources.
Study more about Computer Vision at Computer Vision Class 10