Entra ID is a cloud-based identity and access management service by Microsoft used for external and internal resource access.Entra ID is not a cloud version of Active Directory; it was previously known as Azure Active Directory.Entra ID licensing includes a free tier and Premium P1/P2 licenses with advanced features like Microsoft Entra ID Protection.Entra ID provides authentication features like Self-Service Password Reset, Multi-Factor Authentication, and Passwordless Authentication.Role-based access control (RBAC) in Entra ID follows the Principle of Least Privilege and offers built-in and custom roles.Role assignment in Entra ID involves attaching roles to security principals at specified scopes for access control.Entra ID Premium licenses offer features like dynamic membership groups, Microsoft Identity Manager, and Privileged Identity Management.Entra ID authentication enhances user convenience with features like passwordless authentication using biometrics.Entra ID role assignments involve defining roles, security principals, and scopes for granular access control.Start using Entra ID features gradually and expand as needed; Microsoft Learn is a valuable resource for learning more about Entra ID.