APIs come in various forms, each with unique security challenges. Public APIs are exposed to the internet and often poorly secured, making them prime targets for attackers. Internal APIs are used within an organization but can be accessed by insiders or through compromised systems, posing internal threat risks. Third-Party APIs integrate with external services, which might have varying security postures, leading to potential security gaps. Legacy APIs are older and might not have been updated to incorporate modern security practices, making them vulnerable to exploitation. Additionally, Unsecured Endpoints are APIs lacking proper authentication, authorization, or encryption, offering easy entry points for attackers.