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system mode-> in which the object and field-level permissions of the current user are ignored.
user mode->in which the permissions, field-level security, and sharing rules of the current user are enforced.
For more information go through this link it will help you understand. (look into visualforce controllers section)
http://www.salesforce.com/us/developer/docs/pages/Content/pages_intro_what_is_it.htm
system mode-> in which the object and field-level permissions of the current user are ignored.
user mode->in which the permissions, field-level security, and sharing rules of the current user are enforced.
For more information go through this link it will help you understand. (look into visualforce controllers section)
http://www.salesforce.com/us/developer/docs/pages/Content/pages_intro_what_is_it.htm