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LocalDB is not a standalone "server" in the traditional sense. It is an execution mode of SQL Server Express that runs in user mode. It does not run as a persistent Windows Service. Instead, the database engine starts dynamically when a user connects and shuts down automatically when the last connection closes.

Updated for 2025 context: LocalDB remains relevant despite containerized SQL Server on Linux/macOS, but developers preferring cross-platform may lean toward Azure SQL Edge or SQL Server containers. Still, on Windows, LocalDB is the simplest “zero-config” SQL Server for .NET development.