The user instance feature in SQL Server Express also enables you to work with .mdf files, but the user instance feature is deprecated; therefore, LocalDB is recommended for working with .mdf files.
Typically SQL Server Express is not used for production web applications. LocalDB in particular is not recommended for production use with a web application because it is not designed to work with IIS.
In Visual Studio 2012 and later versions, LocalDB is installed by default with Visual Studio. In Visual Studio 2010 and earlier versions, SQL Server Express (without LocalDB) is installed by default with Visual Studio.
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