The document discusses various corporate strategies used by companies, including: 1) Horizontal integration when Dell acquires Apple, as they both make personal computers. 2) Related diversification when Dell acquires Apple, as Dell makes PCs and Apple makes operating systems for PCs. 3) Backward vertical integration when Dell acquires Intel, as Intel supplies microprocessors to Dell. 4) The strategies demonstrate how companies can grow through acquisition and integration with other businesses in related industries to create synergies.