Can we obtain the programs written in a OS or a app or a game?

Question

is obtaining programs written in some applications is possible if yes can you tell me the steps?

Answer 1

I have a doubt ,why web sites allow to access the programs written in it

Answer 2

Isn't it easy to guess that it is not possible to do so? why would Microsoft design it's OS so that everyone can steal it?

Answer 3

yes there are open source softwares. btw linux is open source os.