In mathematics, especially in set theory, a set A is a subset of a set B, or equivalently B is a superset of A, if A is "contained" inside B, that is, all elements of A are also elements of B. A and B may coincide. The relationship of one set being a subset of another is called inclusion or sometimes containment.

SuperSet Software was a group founded by friends and former Eyring Research Institute (ERI) co-workers Drew Major, Dale Neibaur, Kyle Powell and later joined by Mark Hurst. Their work was based on classwork that they started in October 1981 at Brigham Young University, Provo, Utah, USA, and upon previous work experiences at Eyring Research Institute.