AWS Secrets Manager is specifically designed for managing and rotating secrets such as database credentials, API keys, and other sensitive information. It can automatically rotate secrets on a schedule, making it the appropriate service for this task.

• AWS IAM manages user access and permissions, not credential rotation
• AWS Managed Services (AMS) provides operational support for AWS infrastructure
• Amazon RDS is a managed database service but doesn't handle credential rotation automatically
• AWS Secrets Manager can automatically rotate database credentials and other secrets according to a defined schedule