Hello, I am new here. I searched about this problem but did not get a clear idea. What is the difference if it is iOS 12.5 or whole new number such as iOS 13. I want to know how they are gonna name it. I mean according to what kind of conditions. Even if it, not a decimal version it is an implementation of the same operating system right? So why some of the version named as 12.1, 12.2. 12.3 and some are iOS 11, 12, 13. Can someone explain it?