What's the difference between SQL Server and SQL Server Enterprise?

>>> SQL Server Desktop is a fully featured relational database management system (RDBMS), targeted for personal and shared use, that runs on Windows® 95, Windows 98, or Windows NT Workstation. SQL Server Desktop shares the same code base as SQL Server 7.0 and is available on the SQL Server 7.0 and SQL Server 7.0 Enterprise Edition CD. SQL Server Desktop may be deployed and used on each device to which a per-seat SQL Server Client Access License has been dedicated. SQL Server Desktop is a feature of SQL Server and is not available as a standalone product