Android is an open-source software platform and operating system based on a modified version of the Linux kernel. It was developed by Android Inc. which was purchased by Google in 2005. Android allows developers to use its open-source code and supports wireless communication using 3G, 4G, Wi-Fi and Bluetooth networks. It has gone through many versions since its initial release and is used widely on smartphones and tablets.

1. WHAT IS ANDROID?
 A Software platform and operating system
for mobile.
 Based on the Linux kernel.
 Android was found way back in 2003.
 It was developed in Palo Alto, California.
 Android was developed by the Andy
Rubin, Rich Miner, Nick Sears and Chris
White.
 Android was purchased by the GOOGLE
in AUGUST,2005 for 50 million $.

2.  It’s consortium of several companies.
 This group of companies are allowed to use
source code of Android and develop
applications.
 Reason for Nokia not to develop Android
Mobiles is Nokia is not part of OHA.

3. Android is not a single piece of hardware.
Android supports wireless communication
using:-
 Android is a multi-process system, in
which each application (and parts of
the system) runs in its own process.
 3G Networks
 4G Networks
 802.11 Wi-Fi Networks
 Bluetooth Connectivity

4. FEATURE ANDROID iOS
Ease of use
Voice to text
Gaming
Customizable
Music Player
Notification
system
Google voice

5.  Android Beta
 Android Astro 1.0
 Android Cupcake 1.5
 Android Donut 1.6
 Android Éclair 2.0/2
 Android Gingerbread 2.3
 Android Honeycomb 3.0

6.  Android IceCreamSandwich(ICS) 4.0
 Android JellyBean 4.1
 ANDRIOD KitKat 4.4.2
 ANDRIOD LOLLIPOP 5.0
 ANDROID MARSHMALLOW 6.0
 ANDROID NUGGET

7.  Making source code available to everyone
inevitably invites the attention of hackers.
 Android operating system uses more amount
of battery as compared to normal mobile
phones.
 As there are so many user sometimes it
becomes difficult to connect all the users.
 As we call Android is world of applications
we continuously need to connected with the
internet which is not possible for all the users.