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en.wikipedia.org/wiki/Macintosh_operating_systems

The "classic" Mac OS is the original Macintosh operating system that was introduced in 1984 alongside the first Macintosh and remained in primary use on Macs through 2001.. Apple released the original Macintosh on January 24, 1984; its early system software was partially based on the Lisa OS and the Xerox PARC Alto computer, which former Apple CEO Steve Jobs previewed.

support.apple.com/en-us/HT201260

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 installed by macOS, such as Safari, iTunes, Books, Messages, Mail, Calendar, and Photos.

www.apple.com/macos

The reimagined Mac App Store arrives with a new look and exciting new editorial content. Delve into insightful stories, browse curated collections, even watch videos — each designed to help you fine-tune your search for the perfect app. And it’s all organized around the specific things you love to do on your Mac.

en.wikipedia.org/wiki/List_of_Apple_operating_systems

Mac OS X Server 10.5 – also marketed as Leopard Server; Mac OS X Server 10.6 – also marketed as Snow Leopard Server; Starting with Lion, there is no separate Mac OS X Server operating system. Instead the server components are a separate download from the Mac App Store. Mac OS X Lion Server – 10.7 – also marketed as OS X Lion Server

www.techopedia.com/definition/2639/macintosh-operating-system-mac-os

Macintosh Operating System: The Macintosh Operating System (Mac OS) is an operating system (OS) designed by Apple Inc. to be installed and operated on the Apple Macintosh series of computers. Introduced in 1984, it is a graphical user interface (GUI) based OS that has since been released as multiple different versions. Initially, Mac OS was ...

www.operating-system.org/betriebssystem/_english/bs-macos.htm

Mac System Software Mac OS was named by the company Apple as "Mac System Software" in the beginning, a specially designed operating system only for 68K first Motorola processors. With own Macintosh hardware, Mac OS takes up a special role in the world of desktop systems. The first version was "System 1" and appeared bundled with the Mac in 1984.

download.cnet.com/s/utilities-op-systems-updates/mac

The Operating Systems and Updates category feature the latest update for your system's OS and hardware. Utilities include OS service packs, automatic driver updaters, and more.

whatis.techtarget.com/definition/Mac-OS

Mac OS is the computer operating system for Apple Computer's Macintosh line of personal computers and workstations. A popular feature of its latest version, Mac OS X, is a desktop interface with some 3-D appearance characteristics. OS X has a modular design intended to make it easier to add new features to the operating system in the future.

www.apple.com/macos/how-to-upgrade

Click the download button and follow the onscreen instructions to begin your upgrade. If you don’t have broadband access, you can upgrade your Mac at any Apple Store. Learn more about how to upgrade to macOS Mojave

support.apple.com/en-us/HT201541

Choose System Preferences from the Apple menu , then click Software Update to check for updates. If any updates are available, click the Update Now button to install them. Or click ”More info” to see details about each update and select specific updates to install.