What is the main benefit of using AWS Single Sign-On?

The main benefit of using AWS Single Sign-On (SSO) is its ability to simplify access management for multiple AWS accounts. This service allows users to manage access to multiple accounts and applications from a single location, thereby streamlining the authentication process. With AWS SSO, organizations can achieve centralized management of user identities and permissions, reducing the administrative overhead associated with managing access across various AWS services and accounts. This centralized approach enhances security by allowing for easier enforcement of access policies, and it improves user experience by providing a seamless login experience across different AWS resources.

The other options, while they highlight various AWS capabilities, do not relate directly to the core functionality of AWS Single Sign-On. For instance, unlimited storage pertains to services like Amazon S3, custom application creation relates more to services like AWS Lambda or Elastic Beanstalk, and DDoS attack prevention is generally associated with AWS Shield or AWS WAF (Web Application Firewall), rather than SSO.