If you're a millennial, you may be forgiven for not having a clue how the process works - especially if you've only ever lived through high-speed broadband and social media.
A postal letter has gone viral over the hilarious way the sender attemptedto communicate the recipient's address on the envelope.
Rebecca Cathrine Kaadu Ostenfeld lives on a large horse farm near Búðardalur in the west of Iceland - otherwise known as The Middle Of Nowhere.
Instead of your standard postal address, the sender drew a little map of where they believed the farm was.
Here's the real kicker: the address successfully reached its destination, thanks to the colourful description.
The picture went viral after it was posted to Reddit, prompting social media users to share their own quirky postal stories.
In one case, an overseas Christmas card sent from Germany managed to reach the intended recipient, despite only being addressed to 'England'.
The letter successfully made it to Paul Biggs, from Gloucestershire. The Royal Mail postman said he'd been wandering around with the letter, asking people if they knew the sender, whose address was on the back.