Application Update Version Number ?

Question

I am soon publishing my first Android app made with Unity + JavaScript (I have since switched over to CSharp).

This might be a weird question, but how do publishers get their update version number? Like 1.2.31 can be an update number and 1.0.44 or 1.2. Is there a certain format for this number, why not just +1 for every version? (v1, v2, v3).

Thanks for reading.
- Casper

Answer 1

Well, I too don't know exactly but this may be the case.
+1 for major changes
+0.1 for minor changes
+0.0.1 for bug fixes etc,.