Nearly one-third of the smartphones sold in the U.S. between March and August were loaded with Google's Android operating system, while Apple and Research in Motion each accounted for about 25% of sales, Nielsen reports. In the six months ending August 10, Android phones accounted for 32 percent of the smartphones sold, Nielsen said.
from wikipedia http://en.wikipedia.org/wiki/Android_(operating_system)
Android is a mobile operating system developed by Google and is based upon a modified version of the Linux kernel. It was initially developed by Android Inc. (a firm purchased by Google) and later positioned in the Open Handset Alliance. According to NPD Group, unit sales for Android OS smartphones ranked first among all smartphone OS handsets sold in the U.S. in the second quarter of 2010, at 33%. BlackBerry OS is second at 28%, and iOS is ranked third with 22%.
Android has a large community of developers writing application programs (apps) that extend the functionality of the devices. There are currently over 70,000 apps available for Android with some estimates saying 100,000 have been submitted, which makes it the second most popular mobile development environment. Developers write managed code in the Java language, controlling the device via Google-developed Java libraries.
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