Android OS

Android OS has become the most popular mobile os in the past couple  of years.  Most of the mobiles in today's market have android installed on it.

Android apps

Android has the largest number of apps available for a mobile os.  It has over 1,400,0000 apps available.  You can download  them through google appstore in your device .

Customization

Android is an open source os (branched from linux kernel) . Thus it offers easy customization for  developers and users . It is the most customizable os with various themes,  launchers,  widgets.

Multi tasking

Latest Android os has multi threading and multi tasking built into it.  Android offers better support than IOS and Windows mobile.

Performance

With the introduction of android runtime and new technologies Android's performance is better than ever.  Though it is still a bit slower than windows or IOS you wouldn't find noticible differences in newer models.

Android OS is being used in various devices including phones,  tabs, pcs.