SQL Server 2008 contain five special databases: master, model, tempdb, msdb, and mssqlsystemresource (aka Resource). These databases are used by SQL Server for its own maintenance and management.

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4 types of database in the SQL Server 2008 Master model tempdb msdb

There 4 types of system database Master msdb Tempdb Model

explanation of this is herehttp://msdn.microsoft.com/en-IN/library/ms178028.aspx

Master Model Msdb Tempdb Resource