Trigger is piece of code that is executes before and after a record is Inserted / Updated / Deleted from the force.com database.
A trigger is Apex code that executes before or after the following types of actions:
Trigger is piece of code that is executes before and after a record is Inserted / Updated / Deleted from the force.com database.
A trigger is Apex code that executes before or after the following types of actions: