The Mac's DMG format is similar to the ISO format on Windows, which can be used to mount virtual volumes, clone entire discs, and much more. It's a common way to distribute Mac apps online.

To get up and running, you just need a Mac with an internet connection. There are a handful of minimum requirements, but ...

Apple’s macOS 15.1 Sequoia now lets you install and use applications acquired from the Mac App Store directly onto an external drive.