USB hub, also known as a USB distributor or USB extender, is a type of USB device equipped with multiple USB ports, allowing users to connect several USB devices to a single computer port, effectively expanding one USB port into multiple ports.

1. What is a USB Hub?
   A USB hub, alternatively referred to as a USB distributor or USB extender, serves primarily to offer users additional available USB interfaces, facilitating the connection of multiple devices to a computer simultaneously.

2. Purpose of a USB Hub
   The primary function of a USB hub is to expand one USB port into multiple ports. By utilizing a USB hub, users can connect multiple USB devices (such as printers, scanners, cameras, etc.) to a single computer port without the need for frequent device swapping.

3. Schematic Diagram of a USB Hub
   A USB hub consists of a USB controller and multiple USB interfaces. The USB controller manages data transfer, while each USB interface connects to the host computer via the USB bus. When a device is connected to the USB hub, data is transmitted from the device to the hub and then transferred through the host computer.