A network hub is a device that allows multiple computers to communicate with each other over a network. A USB hub is a device that allows multiple peripherals to connect through a single USB port. It is designed to increase the number of USB devices you can connect to a computer.
Some USB hubs may also feature a power supply, while others do not. The variants with the power supply and generally employed in various organizations.
Example of usage – “If you’re connecting basic devices like a mouse, keyboard, and USB flash drive, and unpowered or “passive” USB hub should work fine.”