Comments, history & assigning people — Read the record's history

The same Activity tab is the record's memory: who created it, every edit with the field name and the old → new values, moves to and from the Trash, posting and unposting, approvals — and the comments, woven in between. Linked records and people show by name, not by id, and edits made by an automation or through the API say so. History respects field permissions: a field hidden from you stays hidden in history too.