Mail order in the olden days consisted of pouring over the Sears & Roebuck or Monkey Ward’s catalog, usually in a room of privacy. When the right item was found, the selection was made by carefully filling out a paper form torn out of the catalog, putting the order in an envelope along with cash or maybe a check, and then waiting for several weeks for the item to arrive.
Olde Dog’s Man ordered a part to fix his lawn tractor from sears.com. He sat down at his computer a week ago, found the part online, and sent his order with a click. No envelope, no cash, no check, no waiting for weeks.
Only the the details have changed from years past, though, because I suspect even now lots of mail orders are placed from the room of privacy.