The Cartesian product of two sets, described with the times symbol x, describes the comparison of two sets where the resulting set contains an ordered pair of every item in the first set matched with every item in the second set. Cartesian products are one of the more unusual and difficult set operations but can be extremely useful when dealing with translating collections of single pieces of information to a two-dimensional space, such as relaying color data to a computer screen. Sets and set theory in general are an important method to conceive of and visualize data, and are a common subject in mathematics and computer science courses.