Kotlin Function function means use big problems divided by submodule and easily problems solved. It makes reusability of code and makes the program more manageable There are two types of functions: Standard library function User-defined function Standard Library Function Kotlin Standard library function is built-in library functions import java.time.LocalDateTime fun main (args: Array < String >) { val current = LocalDateTime.now() println( "Current Date and Time is: $current " ) } User-defined Function A user-defined is created by the user. User-defined function takes the parameter(s), perform an action and return the result of that action as a value. fun main(args: Array<String>){ sum() print( "code after sum" ) } fun sum(){ var num1 = 5 var...