A tuple is a data structure in programming that allows you to store a collection of items. Unlike lists, tuples are immutable, meaning once they are created, their contents cannot be changed. Tuples can hold different types of data, such as numbers, strings, or even other tuples, making them versatile for various applications. In many programming languages, such as Python and Java, tuples are used to group related data together. For example, a tuple can represent a point in a 2D space with coordinates like (x, y). This makes tuples useful for organizing data in a clear and efficient way.