When working with Kotlin, you will come across the concept of a read-only view of a mutable collection. You will probably wonder what is the difference between this and an immutable collection. It is easier to understand using an example. In this case, let's create a mutable list of strings. This applies to all the collections we have covered:

    val carManufacturers: MutableList<String> =  mutableListOf("Masserati", "Aston  Martin","McLaren","Ferrari","Koenigsegg") 
    val carsView: List<String> = carManufacturers 
 
    carManufacturers.add("Lamborghini") 
    println("Cars View:$carsView")  //Cars View: Masserati, Aston Martin, McLaren,  Ferrari, Koenigsegg, Lamborghini 

The code initializes a mutable list of car manufacturers and then provides a view on it via the carsView variable. If, going forward, we only keep a reference to the latter variable, we could actually consider the collection to be fully immutable, hence the read-only...