What is a range in Kotlin?

A range in Kotlin represents an interval between two values, created with the .. operator: 1..10 creates an inclusive range from 1 to 10. Ranges work with any Comparable type, including characters and strings. For an exclusive end, use until: 0 until 10 (0 to 9). For descending ranges, use downTo: 10 downTo 1. You can also specify a step: 1..10 step 2 gives 1, 3, 5, 7, 9. Ranges integrate seamlessly with for loops and the in operator for membership checks.