What is the difference between List and Array in Kotlin?

Both List and Array hold ordered collections of elements, but they differ in several ways. An Array has a fixed size set at creation, is always mutable (you can update elements but not add/remove), and maps directly to Java arrays in the JVM bytecode. A List can be immutable (listOf) or mutable (mutableListOf), integrates with the full Kotlin collections API, and supports a richer set of operations. Prefer List for idiomatic Kotlin. Use Array or specialized arrays (IntArray, DoubleArray) when you need Java interoperability or the performance characteristics of primitive arrays.