Developers use virtualized macOS instances to test applications across different OS versions without needing multiple physical Macs.
Here’s a useful, practical write-up about — what they are, why they’re different from other OS images, and how to create or use one legitimately. mac os iso
You can create a basic ISO from a folder by using Disk Utility (File > Image from Folder), setting the format to "DVD/CD master," and then manually changing the extension from .cdr to .iso . mv ~/Desktop/macOS_install
mv ~/Desktop/macOS_install.iso.cdr ~/Desktop/macOS_install.iso setting the format to "DVD/CD master
Unlike Windows, which provides direct ISO downloads for its operating system, Apple does not officially distribute macOS as an ISO. Users must typically download the official installer from the Mac App Store and manually convert it using the createinstallmedia command-line tool. Primary Use Cases
hdiutil attach /tmp/macOS.dmg -noverify -mountpoint /Volumes/macOS