Mathematical relations describe the way in which two or more quantities are connected or interact with each other. They can be expressed using equations, graphs, or tables, and help to illustrate how changes in one quantity affect another. Common examples include linear relations, quadratic relations, and proportional relationships. In mathematics, relations can be classified as functions or non-functions. A function is a specific type of relation where each input corresponds to exactly one output. Understanding these relations is essential for solving problems in various fields, including science, engineering, and economics.