Trigger Context Variable:

Context Variables allow developers to access run-time context of any trigger.

These context variables are contained in System.Trigger class.

Types of context variable:

Trigger.new: 

trigger ApexTrigger on Account(before insert) 

{    

    for(Account acc: Trigger.new)

    { 

         acc.NumberOfEmployees = 100;

    }

}

Note: This sObject list is only available in insert, update & undelete triggers and records can only be modified in before triggers.

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