- The Photos app in macOS Catalina underwent a major upgrade, bringing many iOS 13 Photos features to the Mac OS. And while Photos retains much of the same user interface as recent versions, the entire app feels snappier, while supporting many new features.
- My favorite editing tool I was used many editing tools on my mac but i'm not satisfied with it. But after using this app, i'm know it's created for me. Perfect app with over 30 high quality filters to edit my photos and makes it more professional. Every steps are so easily and quicly than other app.
Automatically back up photos from your Mac or PC, connected cameras and SD cards. Windows 7 + Mac. MacOS 10.9 + Thanks for downloading Backup and Sync. Get the Google Photos app to back up and view photos on your Android and iOS devices.

Photos is installed by macOS, like Mail and Calendar, as Larry said. The Photos.app is just a wrapper with calls to system services. That is why the application is so amazingly small, lee than 60 MB, just the size of a large RAW file.
Reinstalling Photos can help, if the problem is system wide and not just happens for your current library or only in your own user account.
How To Get The Photos App On My Macbook Pro
To test this, launch Photos from a different user account (see this help page: Isolating an issue by using another user account). If Photos is working perfectly when launched from the Guest User account, the problem is restricted to your current account and trashing plist files or caches, or containers can help, unless your current library is causing the problem. Test with a new test library as well, if Photos is working on a new Photos Library. (https://help.apple.com/photos/mac/1.2/?lang=en#/pht6d60b524)