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Identity as a Service (IDaaS) is a cloud-based service that provides identity and access management solutions hosted by a third-party provider. This service includes features such as user authentication, single sign-on (SSO), and access management to facilitate secure control over user identities and permissions across various applications and services.

By leveraging IDaaS, organizations can reduce the complexity and overhead associated with managing user identities in-house. They benefit from the vendor's expertise in security and compliance, ensuring that their identity management processes are robust and aligned with industry standards. This is particularly important in today's digital landscape, where cybersecurity threats are prevalent, and managing identity management effectively is crucial for protecting sensitive data.

The other options do not specifically address identity and access management services offered by a third party. Infrastructure as a Service (IaaS) and Platform as a Service (PaaS) focus on providing computing resources and application platforms, respectively. Security as a Service (SECaaS) is related to broader security services rather than specifically honing in on identity management. Thus, the focus on identity and access management in IDaaS makes it the correct choice for this question.