What is build in app version?

Question

Building projects

How is the build number calculated, which is usually written in the version of the application? If this is the build number, then how can you find it, for example, in android studio? And why can it be so huge?

or

Answer 1

Every time a product is built from source, it's build
A big number can be for various reasons.
1. A lot of commits (for each individual build).
2. When switching to newer versions, the build number was not reset to zero, but rounded up with a margin. for example, v 1.0-1, v1.0-2, v1.0-3, v2.0-100, v2.0-101
could round up to a thousand with a margin.
3. The build number may contain not just an increment, but for example the date
16082501, 16082502
4. Some troubles.