As you already learned, the core part of SQL Server system is the 'server' which runs as a service. The service is a hidden application that runs in the background and it is hard to deal with this service directly.
SQL Server 2005 comes with a tool called 'Management Studio' which will help you manage your SQL Server. SQL Management Studio allows you to perform various actions on SQL Server including:
1. Create/Delete databases
2. Backup/restore databases
3. Attach/detach databases
4. Design tables and edit data
5. Execute queries against any database
SQL Management studio has a lot more features than explained above. Some of the main functionalists mentioned above are explained in coming chapters.
SQL Management Studio allows you to manage multiple instances of SQL Server installed on same computer or different computers. To manage a specific instance of SQL Server, you have to first connect to the instance using appropriate login and password. You need to install management studio only once even if you install multiple instances of SQL Server.