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 you, opening a DMG file appears as if you're launching the app itself, because it uses the app's icon and name. Once you open a DMG file, you'll see a small window containing the app's icon, which you drag into the Applications folder on your Mac. The DMG format allows developers the ability to customize the size and background of this window, creating some unique install layouts.
This Aymeric on Software blog post does a great job documenting the history of the DMG file, in case you want to learn more about it.
How Rapidmg speeds up the install workflow
Credit: Pranay ParabOnce Rapidmg opens a DMG file, it'll automatically move the app to your Mac's Applications folder, unmount the volume, and delete the DMG file (if you want it to). To use it, install Rapidmg, and then right-click any DMG file. Select Get Info and under Open with:, select Rapidmg. You may click Change All to make Rapidmg the default app for opening DMG files.
That's all there is to it! Rapidmg is a free download via the Mac App Store and you can use it for free for one week. After that, you can pay $1 to unlock the app forever.
As always, you should be cautious when you download Mac apps from unknown developers. While macOS has security protections to keep you from launching suspicious apps, you should still only download apps from reputed developers to avoid accidentally installing malware. Using Rapidmg is safe and it doesn't make you more vulnerable to security threats, but keep your guard up when downloading any apps from the internet.
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