API Security in SaaS focuses on protecting the Application Programming Interfaces (APIs) that enable communication and data exchange between SaaS applications, users, and third-party integrations. It involves securing APIs against threats like unauthorized access, data breaches, and abuse of vulnerabilities. Key practices include robust authentication and authorization mechanisms, input validation, rate limiting, and continuous monitoring of API usage. In the SaaS context, API security ensures that sensitive data remains protected, integrations function securely, and the integrity of the SaaS platform is maintained, even as APIs facilitate extensive connectivity and scalability.