An "Ordered Pair" is a mathematical concept used to represent a pair of elements in a specific order. It is typically written in the form a, b, where 'a' is the first element and 'b' is the second element. The order matters; a, b is different from b, a unless both elements are the same. Ordered pairs are commonly used in coordinate systems, such as the Cartesian plane, where the first element represents the x-coordinate and the second represents the y-coordinate. This allows for precise location identification, making it essential in fields like geometry, algebra, and computer science.