And, this doesnt mean only apps but also the Android OS.
So, why should one update his or her Android OS?
Your manufacturer is responsible for rolling out those updates to your gear.
Also, the look of the interface may vary from brand to brand.
However, overall, the steps should work pretty much on all Android devices.
Step 1: Launch the parameters app on your Android gadget.
Step 2: Scroll down to check for About phone or similar and tap on it.
Step 3: Now, you will find an option as System Updates/Software Update.
Just tap on it.
source: www.techworm.net