<ul><li>Pass-Through Authentication (PTA) allows users to authenticate directly against the on-premises Active Directory (AD) without storing or syncing password hashes to Azure AD. Authentication occurs on-premises, providing a higher level of security.</li><li>Password Hash Synchronization (PHS) synchronizes a hash of the user's password from the on-premises AD to Azure AD. The password hash is securely stored in Azure AD. Authentication occurs in Azure AD, enabling seamless Single Sign-On experiences.</li><li>Key differences include the authentication location, password storage, dependency on on-premises infrastructure, and security measures.</li><li>PTA is suitable for organizations that want to keep authentication local and not store password hashes in the cloud, while PHS is ideal for simplified setup, reduced dependency, and seamless SSO experiences.</li></ul>

Understanding Pass-Through Authentication (PTA) and Password Hash Synchronization (PHS)

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