FaceApp is a popular photo editing app that uses advanced AI technology to transform portrait photos. It offers over 60 filters and effects, including the ability to make yourself look older or retouch your appearance. The app gained popularity in 2019 and was the top app globally. It allows users to edit their photos with realistic facial transformations and has features like boosting attractiveness, adding facial hair, and smoothing out wrinkles. The app is available on both the App Store and Google Play, and has been downloaded by millions of users worldwide.