A SET is a collection of distinct objects, considered as an object in its own right. The elements in a set can be anything, such as numbers, letters, or even other sets. Sets are typically denoted using curly braces, for example, 1, 2, 3 or a, b, c. The key characteristic of a set is that it does not allow duplicate elements. In mathematics, sets are fundamental for various concepts and operations, such as unions, intersections, and differences. They are used in many fields, including computer science, statistics, and logic, to organize and analyze data efficiently. Understanding sets is essential for grasping more complex mathematical ideas.