MSAL, or Microsoft Authentication Library, is a Microsoft-provided SDK that enables applications to authenticate users and securely obtain access tokens for protected APIs. It works by implementing modern identity protocols such as OAuth 2.0 and OpenID Connect, allowing apps to sign users in through Microsoft Entra ID or Microsoft accounts. MSAL handles authentication flows, token acquisition, caching, and automatic refresh, ensuring secure and seamless access to resources. It also supports single sign-on across applications and devices. By abstracting complex identity logic, MSAL helps developers build secure, scalable applications with minimal effort while consistently following modern identity and security best practices.
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