Business combinations occur when two or more companies join together under common control. They form to achieve common objectives like growth, cost reduction, diversification, and tax benefits. There are different types of combinations including horizontal, vertical, conglomerate, and circular combinations. Companies combine through asset or stock acquisitions, mergers, or consolidations. The combined company may preserve separate legal entities or create an entirely new entity. Businesses combine to address issues like competition and business cycles or to achieve economies of scale.