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vijay bhaskarvijay bhaskar 

Hi any one can help to real time scenarios of triggers plz help me i am fail to interviews

normally Salesforce Triggers are simllary to database triggers, they run when you do a dml operation on a object 
nonally triggers are used to 
  • do complex validations that validation rules doesnt support
  • execute logics such as field updates , inserting/updating other object recirds , processes  etc that should always execute inrrespective of  from where dml operations  is tirggered (when data is entered via interface as well as back end operations such as dataloading)