Photo Lab is a photo editing application that offers a wide range of features such as photo effects, filters, face montages, and frames. It is available for both iOS and Android devices, and it has a large community of users. The app allows users to create unique photo montages, collages, and artistic effects. Photo Lab also offers a PRO version with additional premium features and effects, and it is known for its user-friendly interface and the ability to easily share edited photos on social media platforms.