hi guys,
i asking if somebody can tell me what is the build number of software, and why it exist ???
thanks

It's merely a number that identifies that build (compilation) of the software. Each build incorporates one or more changes to that software and numbering them allows you to keep track of those changes incrementally and also to roll back if necessary. It's similar to a fine-grained version number in some respects.

and whether and how it's assigned is completely open to the people assigning it.

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