The Universal Serial Bus (USB) is technology that allows a person to connect an electronic device to a computer. It is a fast serial bus.
It is mostly used on personal computers. USB is also used on other devices, like the PlayStation 3, PlayStation 4, the Xbox 360, and others. USB connects different devices using a standard interface.
Most people use USB for computer mice, keyboards, scanners, printers, digital cameras, and USB flash drives. There are over six billion USB devices around the world.
The standard was made to improve plug and play devices. This means that a device can be plugged into a free socket, and simply work. The computer will notice the device. The computer sometimes installs special software so that the device can directly be used. The device can be removed after it stops being used. This technology is called "hot swapping". "Hot swapping" means it can be plugged and unplugged while the power is on. The computer does not need to be turned off for people to change the devices.

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