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Authentication in C# ASP.NET Core MVC is the process of verifying the identity of a user who is trying to access a secured resource or application. It involves validating the user's credentials such as username and password, and granting access to the resource if the credentials are valid.

ASP.NET Core provides built-in authentication middleware that supports multiple authentication schemes such as cookies, JWT tokens, and OAuth providers. Developers can configure authentication in their ASP.NET Core MVC application by specifying the authentication scheme, authentication options, and authorization policies.

Authentication in ASP.NET Core MVC also includes features like user registration, password reset, and session management, which can be implemented using the built-in Identity framework or third-party authentication providers.