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    A DMG file is a disk image similar to an ISO but created by Apple. Commented May 31, 2021 at 0:37
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    -1 Because "Since the content looks like a small disk, Finder mounts it as if it were a real disk." makes it sound as if that's a bug. A DMG isn't a 'a file whose content looks like a small disk', but it's a disk image meant to virtualize the process of inserting a physical disk. So when you open a DMG you basically are 'inserting a CD' and then you install from the virtual CD. Commented May 31, 2021 at 9:00
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    @DavidMulder I think you are splitting hairs. I deliberately styled my answer to match what I thought was the knowledge level of the questioner. Referring to a "disk image" and "virtualising the process" might well cause confusion. And surely a 'disk image' is a file whose content is like a disk - it contains a file system, just like a disk. Commented May 31, 2021 at 9:06
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    Not a Mac guy but dragging an application from a mounted drive into an applications folder is a lot more intuitive than the Windows or Linux equivalent, unless you're installing from the Windows Store. Commented May 31, 2021 at 15:42
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    Indeed, DMG stands for Disk iMaGe Commented May 31, 2021 at 15:55