Android Version History & Main Features

1. Alpha(1.0)(23 September 2008)
•  Basic Android version
  
2. Beta(1.1)(9 February 2009)
• Change in APIS
• New Permissions
• Cleanup API
  
3. Cupcake(1.5)(27 April 2009)
• On Screen Soft Keyboard
• Home Screen Widgets
• Camera & Gallery
• Bluetooth
   
4. Donut(1.6)(15 September 2009)
• Google Play Store
• Screen Size Diversity
  
5. Eclair(2.0, 2.1)(26 October 2009)
• Google Map Navigation 
• Speech To Text
• Home Screen Costomization
  
6. Froyo(2.2)(20 May 2010)
• Performance
• Voice Action
• Portable Hotspot
  
7. Gingerbread (2.3)(9 February 2011)
• NFC(Near Field Communication)
• Battery Management
• Gaming
  
8. Honeycomb(3.0)
• Quick Setting
• Tablet Supported Designs
• System Bar
  
9. Ice Cream Sandwich(4.0)(16 December 2011)
• Custom Home Screen
• Data Management
  
10.  Jelly Bean(4.1, 4.2, 4.3)(9 July 2012, 13 November 2012, 24 July 2013 )
• Account Switching
• Google Now
• Account Switching
  
11. Kitkat(4.4)(31 October 2013)
• OK Google(Voice)
• Smart Dialer
  
12. Lollipop(5.0, 5.1)(3 November 2014, 9 March 2015)
• Material design
• Multi Screen
• Notification on Lock Screen
  
13. Marshmellow(6.0)(5 October 2015)
• Run Time Permissions
• Battery
• Performance
  
14. Nougat(7.0 - 7.1)(22 August 2016, 4 October 2016)
• Split Screen
• Security