And some users would want to spend time on the bigger screen of their computer rather than on the smaller screens of smartphones. Why would one want to do that? There are several reasons for that again but one of them is to try out how the app runs, for developers to try them out. If that is not enough, one can also use an OS emulator to try out the entire Android OS on the computer. There are a lot of reasons why Android OS is preferred by many, but one of them is that the OS is open-source and you can do a lot of customization and personalization. While for computers we see Windows and Mac OS having a great number of users, smartphone OS market is well dominated by Android OS over the others, where the second place is held by iOS, having almost 1/3 number of users.