What are the versions of Android?

List of some major Android versions released over the years:

1. Android 1.0 (no codename): September 2008
2. Android 1.1 (Petit Four): February 2009
3. Android 1.5 (Cupcake): April 2009
4. Android 1.6 (Donut): September 2009
5. Android 2.0/2.1 (Éclair): October 2009
6. Android 2.2 (Froyo): May 2010
7. Android 2.3 (Gingerbread): December 2010
8. Android 3.0/3.1/3.2 (Honeycomb): February 2011 (primarily for tablets)
9. Android 4.0 (Ice Cream Sandwich): October 2011
10. Android 4.1/4.2/4.3 (Jelly Bean): July 2012
11. Android 4.4 (KitKat): October 2013
12. Android 5.0/5.1 (Lollipop): November 2014
13. Android 6.0 (Marshmallow): October 2015
14. Android 7.0/7.1 (Nougat): August 2016
15. Android 8.0/8.1 (Oreo): August 2017
16. Android 9 (Pie): August 2018
17. Android 10: September 2019
18. Android 11: September 2020
19. Android 12: October 2021

These versions represent the evolution of the Android operating system, with each release introducing new features, improvements, and optimizations. It’s important to note that device manufacturers and carriers may not always update their devices to the latest Android version immediately, leading to a diverse ecosystem of devices running different Android versions concurrently. Additionally, after Android 10, Google shifted to a numerical naming convention, moving away from using dessert names for Android versions. Please check the latest sources for any updates beyond my last knowledge update in January 2022.