Failure is the default outcome in business—but we rarely study it. We celebrate the winners, avoid talking about the losers, and repeat mistakes that were already made. Failurepedia documents failed companies, products, and strategies to uncover what went wrong, why it happened, and what we can learn from it. Because sometimes the smartest way to succeed is to understand how others failed. Source-backed case studies of over 200 failed companies, products, and launches.