Final answer:
The 'getOld()' method returns a list of old versions of sObject records in Salesforce update and delete triggers. It allows access to previous field values of the record.
Step-by-step explanation:
The getOld() method returns a list of the old versions of the sObject records. This method is specifically available in update and delete triggers in Salesforce. When a record is updated or deleted, the getOld() method allows you to access the previous values of the fields in the record.