Mac OS X was originally presented as the tenth major version of Apple's operating system for Macintosh computers; current versions of macOS retain the major version number "10".What is the current Mac OS?
To find out which macOS is currently running on your Mac, follow these steps: Click on Apple logo in the top left corner of the menubar In the dropdown click on the first item: About This Mac The first line in the Overview tab is the name of the current OS.How do you check Mac OS version?
How to Find Your OS X Version Number Click the Apple icon at the top left of your screen. Choose the first item in the menu, “About This Mac.” Take note of your Mac operating system, both by its codename and its version number. For instance, this is v10.10.5, also known as Yosemite.