1. *Android 1.0 (2008):* The inaugural version.
2. *Android 1.5 Cupcake (2009):* Introduced widgets and third-party keyboard support.
3. *Android 1.6 Donut (2009):* Added support for CDMA networks and screen resolutions.
4. *Android 2.0/2.1 Eclair (2009):* Included multiple account support and a refreshed UI.
5. *Android 2.2 Froyo (2010):* Introduced Wi-Fi hotspot functionality and Adobe Flash support.
6. *Android 2.3 Gingerbread (2010):* Brought a refined UI and improved performance.
7. *Android 3.0/3.1/3.2 Honeycomb (2011):* Designed specifically for tablets.
8. *Android 4.0 Ice Cream Sandwich (2011):* Unified phone and tablet interfaces.
9. *Android 4.1/4.2/4.3 Jelly Bean (2012):* Featured Project Butter for smoother performance.
10. *Android 4.4 KitKat (2013):* Focused on optimization for lower-end devices.
11. *Android 5.0/5.1 Lollipop (2014):* Introduced Material Design and improved notifications.
12. *Android 6.0 Marshmallow (2015):* Focused on app permissions and Doze for battery optimization.
13. *Android 7.0/7.1 Nougat (2016):* Improved multitasking and introduced Vulkan API for graphics.
14. *Android 8.0/8.1 Oreo (2017):* Featured Project Treble for faster updates and notification channels.
15. *Android 9 Pie (2018):* Introduced gestures, Adaptive Battery, and Adaptive Brightness.
16. *Android 10 (2019):* Revamped navigation gestures and introduced system-wide dark mode.
17. *Android 11 (2020):* Focused on conversation organization, chat bubbles, and media controls.
18. *Android 12 (2021):* Introduced Material You design and privacy dashboard.
19. *Android 13 (2023):* lntroduces a predictive back gesture for Android devices such as phones, large screens, and foldables. Android 13 adds built-in support for LE Audio, so developers should get the new capabilities for free on compatible devices.