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Prabitha SPrabitha S 

trigger definition anybody explain me pls

ShashankShashank (Salesforce Developers) 
https://www.salesforce.com/us/developer/docs/apexcode/Content/apex_triggers.htm
Sumitkumar_ShingaviSumitkumar_Shingavi
Read below links for understanding Apex Triggers in detail:
1. https://www.salesforce.com/us/developer/docs/apexcode/Content/apex_triggers.htm
2. https://developer.salesforce.com/page/Trigger_Frameworks_and_Apex_Trigger_Best_Practices
3. https://www.salesforce.com/us/developer/docs/apexcode/Content/apex_triggers_context_variables.htm

PS: if this answers your question then hit Like and mark it as solution!
Vijay NagarathinamVijay Nagarathinam
Hi,

Refer the following links that are helpful for u.

http://www.sfdc99.com/2013/05/09/what-is-a-salesforce-trigger/

https://help.salesforce.com/HTViewHelpDoc?id=code_define_trigger.htm&language=en_US