Android Versions

Android:

Android is a mobile operating system  which was developed by Google based on the Linux kernel and designed for touchscreen mobile devices such as smartphones and tablets.Android has largest installed base of all operating systems (OS) of any kind. Android has been the best selling OS.Android's source code is released by Google under open source licenses.

Cupcake:

Android 1.5  Cupcake was the second Android version developed by Google, a major platform release deployable to Android-powered handsets started in May 2009 and it  included new features on-screen keyboard and Bluetooth support and improvements to existing features such as UI changes for application management and several Google apps.

                                                                                                                        Donut:

Android 1.6 Donut  is a version and the dessert liked themed Android code name for the version 1.6 update. adding new features just like support for CDMA smartphones, support for additional screen sizes, a battery usage indicator, and a text-to-speech engine. 

Eclair:

Android Eclair is a discontinued version of the Android mobile OS by Google. Unveiled on October 26, 2009, Android 2.1 builds upon the changes made in Android 1.6 "Donut". Major  features included camera app was  redesigned with  new camera features, including flash support, , scene mode , color effect, white balance and macro focus , digital zoom.