The road to get to the current version of macOS, with all the features it has today, has been long. In case you are wondering which versions of the operating system Apple has launched so far, the following is an updated list at the time of the publication of this book. This information is also useful when you are dealing with the requirements of certain apps and features; you will most likely read something such as OS X Yosemite and later, so you need to know which versions come later or earlier:
| Version name | Version number |
| macOS Big Sur | 11.0 |
| macOS Catalina | 10.15.6 |
| macOS Mojave | 10.14.6 |
| macOS High Sierra | 10.13.6 |
| macOS Sierra | 10.12.6 |
| OS X El Capitan | 10.11.6 |
| OS X Yosemite | 10.10.5 |
| OS X Mavericks | 10.9.5 |
| OS X Mountain Lion | 10.8.5 |
| OS X Lion | 10.7.5 |
| Mac OS X Snow Leopard | 10.6.8 |
| Mac OS X Leopard | 10.5.8 |
| Mac OS X Tiger | 10.4.11 |
| Mac OS X Panther | 10.3.9 |
| Mac OS X Jaguar | 10.2.8 |
| Mac OS X Puma | 10.1.5 |
| Mac OS X Cheetah | 10.0.4 |
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