Android is a mobile operating system (OS) that is based on a modified version of the Linux kernel, designed mainly for touchscreen devices such as smartphones and tablets. Android is developed by a group of developers known as the Open Handset Alliance, but its most widely used version is primarily developed by Google. It was released in November 2007, with the first commercial Android device, the HTC Dream in September 2008. The operating system is known as Android Open Source Project (AOSP) and is free and open-source software (FOSS) primarily licensed under Apache License. Most devices today run on Android version developed by Google, which has an additional proprietary closed-source software pre-installed, most notably Google Mobile Services (GMS) that includes core apps such as Google Chrome, Google Play, and Google Play Services development platform.