This document discusses mergers and acquisitions (M&As) in corporate America. It notes that M&A activity spiked in the mid-1980s and 1990s due to availability of financing, and decreased in the early 2000s during an economic recession. The types and reasons for M&As are described, including improving synergies, diversifying, increasing market power and growth. Takeovers can be friendly or hostile. Defensive strategies by target firms against takeovers are also outlined, including poison pills and antitakeover laws. While takeovers may discipline underperforming managers, defenses can also benefit shareholders by increasing bid prices.