All you really need to do is double-click the DMG file to open it and mount it to your Mac. Well, luckily macOS does an excellent job of making everything easy. RELATED: Benchmarked: What's the Best File Compression Format? So How Do I Use DMG Files? Saving your data usage on downloads is always a good thing. And that’s second reason why macOS uses DMG files: they’re a compressed format (like a ZIP file) that makes your download smaller. This little window first goes through a phase of verifying the file, and then once it’s sure the file is good, moves on to decompressing it. This is what you see when the file is opening: DMG files include something called a checksum, which basically verifies that the file is 100% intact.
The main reason macOS uses DMG files is to make sure the file downloaded properly and wasn’t tampered with.
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