Android Inc. was firstly founded by Andy Rubin, Rich Miner, Nick Sears and Chris White in Palo Alto, California US.

1.6, Donut:
android-1.6
Android 1.6 was released on September 15, 2009. It was earliest version that was released out without knowing that this OS is going to bring a big revolution in mobile world in near future.

2.0, Eclair:
android-2.0-eclair
In November 2009, Android developers rolled out a major update to the OS just after one and half months of Android birth. This update brought several improvements and stabilities to the OS.

2.2, Froyo:
2.2-froyo
On May 20, 2010, Android's v2.2 came out with some major updates. This version of the OS was named as Froyo!

What is Android?

History of Android
Android History
Android 1.6 Donut
Android 2.0-2.1 Éclair
Android 2.2-2.2.3 Froyo

Current:Current version of Android OS is v5.0 that has been named as Android L., the Android Lollipop.