The .dmg extension stands for . It is the standard format used to distribute software on macOS. Think of it as a virtual "box" that contains the application. When you double-click a DMG file, your Mac mounts it as a virtual drive, allowing you to drag the application into your Applications folder.
If you hate subscription models (SaaS) and want a professional editor that feels like a native Mac app, Photomator 3.2.2 is the best Lightroom alternative on the market. Photomator-3.2.2.dmg
: The app uses a "Freemium" model. It is free to download as a trial but requires a monthly, yearly, or lifetime license for full functionality. or lifetime license for full functionality.