APIs power todayโs software, but with AI tools accelerating development, many organizations donโt even know how many APIs they haveโor how secure they are. Shadow, zombie, and rogue APIs can quietly expand your attack surface, leaving critical vulnerabilities unchecked. Thatโs why modern API discovery tools are essential. This guide breaks down what API discovery is, why it matters more than ever in 2025, and how to choose the right tool to secure your entire API landscape.