upload

Load comes from Old English lad, meaning a way, course, or carrying. By Middle English, it described the burden carried on a journey — a cartload, a shipload. To load a ship was to place cargo on it for transport. The word retained this physical sense of weight and conveyance even as it transferred to abstract uses: loading a gun, loading the dice.

When early networked computers transferred files in the 1960s and 1970s, engineers needed verbs for the direction of transfer. Download — carrying data down from a central server to a local machine — borrowed the metaphor of bringing cargo off a ship. Upload — sending data up from a local machine to a central server — was the reverse cargo operation: loading the ship for departure.

The terms were established in ARPANET documentation by the mid-1970s. The directional metaphor (up/down) reflected the early network architecture: central mainframes were conceptually 'above' the terminals connected to them. When the internet made peer-to-peer networking common, the hierarchy blurred — but the words remained.

Today upload describes any transfer from a device to the cloud: photographs, videos, documents. The word has lost most of its directional logic (there is no meaningful 'up' on the internet) but retains its cargo metaphor. Every uploaded file is still a burden placed on a vessel for transport to somewhere else.