Trigger context variables in Apex provide information about the nature of the trigger execution. These variables include details like which records are being processed, what kind of operation (insert, update, delete, undelete) is occurring, and whether the context is before or after the operation. For example, Trigger.new contains the new versions of the sObject records in an insert or update operation, while Trigger.old contains the old versions in an update or delete operation. Understanding and utilizing these context variables is crucial for writing effective and efficient triggers.
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