Tuples in C# are lightweight data structures that allow you to group multiple related values into a single object. Unlike classes or structs, tuples don't require defining a specific type beforehand. Tuples are useful when you need to return multiple values from a method or store related data without creating a custom class or struct.

Tuples are great for simple scenarios where you need a temporary container for related values, but for more structured or reusable scenarios, using custom classes or structs is generally recommended.