While typing user identification we might do some mistakes, To avoid that we will can store the identification details inside a QR code. Which will reduce human error.

As we all know Android phones are used by all kinds of people. So making apps in their language will make the user comfortable.

Kotlin is an official language for Android, which is announced in Google I/O . It's expressive, concise, and powerful. Best of all, it's interoperable with our existing Android languages and runtime.

In Kotlin we don't need to provide data type explicitly(most of the time) for the variables. According to the value of the variable data type is taken by kotlin itself.