Android OS for mobile has become very famous these days; it is most widely used OS for mobile these days. Android itself comes with basic set of utilities and bets thing is there are thousands of apps available which can be used to enhance the utility of your mobile as per your need. To download apps of your choice you need Google account and have to visit Google Play store. Though you can browse and select Apps without signing in but to download you have to sign in using your Google account.
If you want to download the Apps without Google account for any reason, (like app is not supported for your phone, or your phone does not have Play store access), there is a way to do that as well. People generally think there is no way and they install apps from untrusted source but now you can download all such apps yourself from Google Play store.