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A USB hub is an electronic device that expands a single Universal Serial Bus (USB) port into several so that multiple peripherals can be connected to a computer or other host device. Typically, a USB hub contains a number of downstream ports and one upstream port, which connects the hub to the host. The hub may also provide power to connected devices, either from an external power supply or by drawing additional current from the host through the upstream port. USB hubs are useful for connecting a variety of computer accessories, including flash drives, tablets, and other USB-enabled devices. They come in various shapes and sizes, with some designed to be portable and others intended for more permanent installation. Some hubs also offer additional features such as data transfer acceleration or built-in cable management systems. Overall, USB hubs are an essential component of many computer setups, providing a convenient and flexible way to connect multiple devices to a single host.