Mac, iPod, iPhone & iPad Answers. Also see: Recently Added Q&As EveryMac.com answers many of your frequently asked questions about Apple hardware and software. If you are not sure which Mac or device you have, look it up with EveryMac.com's Ultimate Mac Lookup or the EveryMac app.If you need help locating specific identifiers, refer to Mac Identification and iPod, iPhone & iPad Identification. OS X (Pronounced as O-S 10) is an Operating system developed by Apple.OS X incorporates support for UNIX-based applications as well as for those written just for the Macintosh (Mac devices). Below, you can find a complete list of OS X version code names, along with internal code names (if available). Mac OS X is a line of Apple operating systems (OS) included in every modern Macintosh (Mac) computer. It is the successor to the classic Mac OS 9. In March 2001, Apple released the first Mac OS X operating system to hit the market: Mac OS X 10.0 Cheetah. Mac OS X operating systems are based on UNIX.

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• Mac OS X was released in March 2001, but many components, such as Mach and BSD, are considerably older. Understanding the design, implementation, and workings of Mac OS X requires examination of several technologies that differ in their age, origins, philosophies, and roles.
• Mac OS, Mac OS X, or macOS, is the operating system that resides on Apple’s desktop and portable computer lineup. Built upon a Unix core, it is easy to use yet highly advanced, extremely stable, and an excellent OS for productivity and creation.

Is your Mac up to date with the latest version of the Mac operating system? Is it using the version required by a product that you want to use with your Mac? Which versions are earlier (older) or later (newer, more recent)? To find out, learn which version is installed now.

If your macOS isn't up to date, you may be able to update to a later version.

Which macOS version is installed?

From the Apple menu  in the corner of your screen, choose About This Mac. You should see the macOS name, such as macOS Big Sur, followed by its version number. If you need to know the build number as well, click the version number to see it.

Which macOS version is the latest?

These are all Mac operating systems, starting with the most recent. When a major new macOS is released, it gets a new name, such as macOS Big Sur. As updates that change the macOS version number become available, this article is updated to show the latest version of that macOS.

If your Mac is using an earlier version of any Mac operating system, you should install the latest Apple software updates, which can include important security updates and updates for the apps that are installed by macOS, such as Safari, Books, Messages, Mail, Music, Calendar, and Photos.

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Trade in with Apple

Turn an eligible device into credit towards a new one, or recycle it for free. Apple Trade In is good for you and the planet.

Get Support

Choose a product and we’ll find you the best solution.

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Service and support from Apple experts

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AppleCare products provide additional hardware service options and expert technical support from Apple.

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Beware of counterfeit parts

Some counterfeit and third party power adapters and batteries may not be designed properly and could result in safety issues. To ensure you receive a genuine Apple battery during a battery replacement, we recommend visiting an Apple Store or Apple Authorized Service Provider. If you need a replacement adapter to charge your Apple device, we recommend getting an Apple power adapter.

Also non-genuine replacement displays may have compromised visual quality and may fail to work correctly. Apple-certified screen repairs are performed by trusted experts who use genuine Apple parts.

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