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 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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