I'll briefly explain to you what a tuple is - it's a data structure that combines a certain number of elements of one or more types, and they can be useful when we need to return multiple results of a function at once. But how tuple creation in Scala can't be explained so briefly, so I'd rather give you a link where it's written in detail https://studentprojectcode.com/blog/how-to-create-an-array-for-tuples-in-scala.