Joint ventures involve two or more businesses cooperating on a specific project by sharing profits, losses, and control. They are short-term partnerships where members pool resources for a profitable venture. Mergers occur when two companies legally combine into one entity under shared management. Acquisitions happen when one company purchases a controlling stake in another and manages both under one team, which may include managers from both original companies. Mergers and acquisitions allow companies to access new resources, technologies, markets, and management strategies.