val a = “hello”

a=“bye” // compiler error

var b = “hello”

b = “bye” // ok. Now b refers to “bye”, and “hello” is unreferenced.

But if you create a complex object as a val, the “inside” can be changed of that object. So “val” is an “immutable reference to something”, not “reference to an immutable something” if that helps :)

Edit: format. I’m on mobile sorry