What and When to use Tuple? [duplicate]

This msdn article explains it very well with examples, “A tuple is a data structure that has a specific number and sequence of elements“.

Tuples are commonly used in four ways:

1. To represent a single set of data. For example, a tuple can
   represent a database record, and its components can represent
   individual fields of the record.

2. To provide easy access to, and manipulation of, a data set.

3. To return multiple values from a method without using out parameters
   (in C#) or ByRef parameters (in Visual Basic).

4. To pass multiple values to a method through a single parameter. For
   example, the Thread.Start(Object) method has a single parameter that
   lets you supply one value to the method that the thread executes at
   startup time. If you supply a Tuple<T1, T2, T3> object as the method
   argument, you can supply the thread’s startup routine with three
   items of data.