1. Introduction
- Android is an Open Source Operating System for Mobile devices like Smartphone and Tablet.
- Android was developed by the Open Handset Alliance and commercially sponsored by Google.
- It was unveiled in November 2007, First commercial Android Device launched in September 2008 named as HTC Dream.
2. Key Featured of Android OS
- User Interface
- Multiple Language Support
- Multi-tasking
- Connectivity
- Extensive Application Support
3. Major Android Releases
| Year | Name |
| 2009 | Cupcake (v. 1.5) |
| 2009 | Donut (v. 1.6) |
| 2009 | Eclair (vs. 2.0, 2.0.1, and 2.1) |
| 2010 | Froyo (vs. 2.2 through 2.2.3) |
| 2010 | Gingerbread (vs. 2.3 through 2.3.7) |
| 2011 | Honeycomb (vs. 3.0 through 3.2.6) |
| 2011 | Ice Cream Sandwich (vs. 4.0 through 4.0.4) |
| 2012 | Jelly Bean (vs. 4.1 through 4.3.1) |
| 2013 | KitKat (vs. 4.4 through 4.4W.2) |
| 2014 | Lollipop (vs. 5.0 through 5.1.1) |
| 2015 | Marshmallow (vs. 6.0 through 6.0.1) |
| 2016 | Nougat (vs. 7.0 through 7.1.2) |
| 2017 | Oreo (vs. 8.0 and 8.1) |
| 2018 | Pie (v. 9.0) |
| 2019 | Android 10 |
| 2020 | Android 11 |
| 2021 | Android 12 |
