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  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) 20

Click on below link to watch video How to Clear Android App cache                                   

    1. BlueBorne malware: The BlueBorne attack spreads via Bluetooth The hacker doesn't need to pair with the device to infect malware The attack can spread malware on Android, Linux, Windows, and iOS devices. Precaution: 1. Keep your mobile Bluetooth off.  2. Use Bluetooth when require. Note: Check your device is affected or not using app. Click Here for app .