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Hey
Trigger.new : Returns a list of the new versions of the sObject records. Note that this sObject list is only available in insert and update triggers, and the records can only be modified in before triggers.
Trigger.old : Returns a list of the old versions of the sObject records. Note that this sObject list is only available in update and delete triggers. For more detail follow below link:http://www.salesforce.com/us/developer/docs/apexcode/Content/apex_triggers_context_variables.htmDid this answer your question? If not, let me know what didn't work, or if so, please mark it solved.
Thank you,
Priya Ranjan