Everything in this operating system is touch based, such as virtual keyboard, swiping, tapping, pinching etc. that are very similar to the things used daily. There are many features available in this like mobile games, cameras etc. Due to this, Android has become the most used operating system in the present time. The source code of the Android system was released under Google's open source license, but most Android-based devices come in free, open and proprietary software content.