This document defines and compares horizontal and vertical integration in business. Horizontal integration involves expanding into similar business activities at the same level of the value chain, such as a radio station acquiring a newspaper. Its advantages include economies of scale and scope, while disadvantages include increased costs and responsibilities. Vertical integration means a company owns suppliers and distributors, such as a car manufacturer owning steel mills. The three types are backward, forward, and balanced integration. Vertical integration can reduce costs but also raises challenges around capacity balancing and decreased flexibility.