Difference between SYS and SYSTEM user

Hi,
Well, one of my colleagues have asked me the difference between SYS and SYSTEM user .. Normally these are the users which will be under the monitoring of the DBA .. So, how could I know the difference between these two users ..
Please assist me
Regards

SYS is the owner of the database and the owner of the data dictionary.
The objects belonging to SYS cannot be exported. But SYS has the SYSDBA privilege which SYSTEM doesn't.
SYSTEM is a privileged administration user, and typically owns Oracle provided tables other than the dictionary.
SYSDBA is not a role, it is a privilege. You'll find it in system_privilege_map, not in dba_roles.

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