Final answer:
In Salesforce, a workflow rule can update a field after the record is saved. The workflow rule triggers once the record meets specified criteria and has been committed to the Salesforce database.
Step-by-step explanation:
When considering workflow rules within Salesforce, it’s important to understand when a field can be updated by such a rule. A workflow rule can update a field after a record is saved. This happens when certain specified criteria are met, and the field update occurs after the Salesforce database commit phase. It is not possible during record creation because the record must first be saved before the workflow can trigger any updates. Moreover, workflow rules are not restricted to specific profiles; they can apply across different profiles provided the necessary permissions are set.