Were ANDROID,IOS and various other things also software.if so what are they developed with.And whats their code.

Question

what is ANDROID and IOS.Were they are also softwares like any softwares like "hello world."

Answer 1

Yes, they are also software.
The low-level applications, such as operating systems, language compilers and interpreters, etc. are usually written in c or c++, because they are compiled directly into machine code and do not need any extra software to run.
E.g. you can get Android source code from
https://source.android.com