An Apple technical note that explains and lists Mac OS builds.
You can choose Apple > About this Mac to get basic information about your Macintosh, including the version of System software installed, the model name, and the amount of RAM. But if you click the System software version information, the display changes to indicate a specific build of that system software. You can see this in the screen shot here.
Apple’s support Web site has additional documents that tell you more about build information. From Mac OS X: About This Mac “build” information on :
The build version you see depends on the version of Mac OS X that you have installed. The version changes when you use the Software Update feature to update core system software.
The article lists various versions of Mac OS and corresponding builds and provides helpful links to related documents.
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