Doubles, also known as pairs, refer to a set of two identical items or units. In various contexts, such as sports, games, or mathematics, doubles can represent two players working together or two matching numbers. For example, in the game of tennis, doubles matches involve two teams of two players each, competing against one another. In mathematics, doubles can refer to pairs of numbers that are the same, like (2, 2) or (5, 5). This concept is often used in probability and statistics, where understanding pairs can help analyze data sets. Overall, doubles play a significant role in both recreational activities and mathematical concepts.