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I ve heard hubs can be bus-powered or self-powered. What is the difference?

April 26, 2017bus-powered heard HUBS self-powered ve

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I ve heard hubs can be bus-powered or self-powered. What is the difference?

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The USB specification requires that power be provided on the bus for use by low-power devices. Hubs can utilize this power for operation, and are thus referred to as bus-powered hubs. Hubs may also include an AC adapter that provides external power to the hub. Such hubs are referred to as self-powered hubs. Some hubs may be included within other devices such as displays, keyboards, and printers. Such devices are known as compound devices.