Android is a Linux-based operating system for mobile devices such as
smartphones and tablet computers, developed by Google in conjunction
with the Open Handset Alliance. It had a worldwide smartphone market
share of 59% at the beginning of 2012, and as of year 2012 there were
500 million devices activated and 1.3 million activations per day.

There are a host of advantages that Android OS has like Open Platform/ License Free, Robust OS Kernel, Innovative Library Packages,
Easy Application Development, Rapid Improvement, etc.
The advantages are listed below:-