The origin of the word

The word “dongle” entered the technology lexicon in the early 1980s. Its precise origin is disputed. The most commonly cited theory is that it derives from “dangle” – these devices literally dangled from a port at the back of a computer. Another theory credits the coinage to developers at Rainbow Technologies, a California company that manufactured copy protection hardware.

The word appears in Macintosh documentation from 1984 and was in common use among software developers by the mid-1980s. It did not appear in mainstream dictionaries until the 1990s.

The original dongle: software copy protection

The dongle was invented to solve a specific problem: software piracy. In the early 1980s, commercial software was expensive to develop and trivially easy to copy. Floppy disks offered no practical copy protection.

The solution was hardware. A software protection dongle – initially a parallel port device, later USB – had to be physically connected to the computer for the software to run. The application polled the dongle at startup and during operation. Without it, the software refused to launch. Copy the disk all you like – without the hardware key, it was useless.

Aladdin Knowledge Systems (later SafeNet), Rainbow Technologies, and Wibu-Systems became the dominant manufacturers of protection dongles. Products like the HASP (Hardware Against Software Piracy) key became standard in high-value professional software – CAD packages, broadcast systems, audio production suites.

The transition to USB

Throughout the 1990s, dongles used parallel ports (the large rectangular connector used by printers). When USB became the dominant PC interface from the late 1990s, dongle manufacturers transitioned to USB. The smaller form factor and the ubiquity of USB ports made dongles more convenient and harder to notice.

The mobile broadband era

The term dongle underwent its biggest semantic shift in the late 2000s. Mobile operators began selling USB modems – small devices that plugged into a laptop USB port and connected to 3G mobile networks. Vodafone, T-Mobile, Orange, and Three all launched them in the UK between 2006 and 2008.

These devices were universally called “dongles” by UK consumers and the press, even though they had no relationship to software copy protection. The term had become a generic descriptor for any small, purpose-built USB device. By 2010, “dongle” most commonly referred to a mobile broadband stick in UK usage.

The Apple era and the dongle backlash

In 2016, Apple launched the MacBook Pro with only USB-C ports, removing all USB-A, HDMI, and SD card slots. Users needed adapters to connect existing peripherals. Apple sold these as “USB-C to X adapters” at premium prices. The technology press and users called them dongles.

The “dongle” became a symbol of Apple’s controversial design philosophy – the internet filled with images of MacBooks trailing clusters of adapters. Apple’s dongle era drove mainstream awareness of the word to new heights and significantly boosted USB-C hub and adapter sales across the industry.

The dongle today

In 2026, “dongle” is a broad informal term for any small plug-in adapter or peripheral. It covers WiFi adapters, mobile broadband modems, Bluetooth adapters, HDMI streaming sticks, USB-C hubs, security keys, and software protection devices. The word has no single precise meaning – context determines what kind of dongle is meant.

The hardware protection dongle market still exists, largely unchanged, for professional software. Mobile broadband dongles have evolved from 3G USB sticks to 5G modems. WiFi dongles have progressed from 802.11b to WiFi 6. The form factor has stayed remarkably consistent – small, portable, bus-powered – while the technology inside has transformed entirely.