in mathematics, a tuple is a finite sequence of objects. sometimes, the finite sequence is also called an "ordered list". this means that the order of the objects matter. in a tuple, the objects are either enclosed within parentheses (such as formula_1), or within angle brackets (such as formula_2). each of the objects in the list has a certain type. a tuple consisting of "n" entries is called an n-tuple. tuples are used to describe mathematical objects that are made of certain, well-defined components. they are also used very frequently with databases.