Access Control in SaaS Security is the practice of managing and regulating user access to SaaS applications, data, and resources to ensure that only authorized individuals can interact with specific functionalities or sensitive information. In a SaaS environment, this involves implementing role-based access control (RBAC) or attribute-based access control (ABAC) tailored to organizational policies and user responsibilities. Key mechanisms include multi-factor authentication (MFA), integration with identity and access management (IAM) systems, and granular permission settings to enforce least privilege access. Effective access control in SaaS minimizes the risk of unauthorized access, protects sensitive data, and supports compliance with security regulations.