What is the main role of lambda functions in programming?

Lambda functions in programming are anonymous functions that allow writing compact and concise code, especially when a small function is needed without the necessity of creating a full named method. They are often used to pass functions as parameters, for example, in event handlers, filtering, or sorting collections.

Example in Kotlin (Android):

val numbers = listOf(1, 2, 3, 4)
val doubled = numbers.map { it * 2 } // lambda function doubles each element
println(doubled) // [2, 4, 6, 8]