This document explores hostile takeovers in the corporate world, explaining what they are and why companies fear them. It then details various defensive techniques companies can employ to ward off unwanted acquisition bids. These include strategies such as the 'Crown Jewels', 'Poison Pill', 'Greenmail', 'White Knight', 'Golden Parachutes', and 'Pac-man defence'. This guide is useful for business leaders, executives, and anyone interested in corporate strategy and mergers and acquisitions.