Archiving a document allows you to keep a record of it within the programme while hiding it from newly enrolled learners. Learners who have already acknowledged the document (ticked "I have read and understood this document") will still be able to view it after archiving, but it will not be visible to new learners or those who have not acknowledged it.
Deleting a document permanently removes it from the programme, meaning it will no longer be visible to any learners, and no record of it will be kept.
Archive when you want to retain a document for reference but prevent new learners from accessing it.
Delete when you no longer need the document at all.