system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How does a USB hub work?

How do they manage to combine 4 or 6  USB signals into one USB cable?
gpt
USB is a packet based communications bus. To send data between the devices the data is gathered into a suitable packet of data and then transmitted over the wires. When the packet have been sent the device will switch over to listening for incoming packets from the other device. As USB was designed with USB hubs in mind each packet have a device ID marker on it so that the hub is able to send it to the correct device. There is also a way for the hub to send a message back to the device when there is an incoming packet saying it is busy with another packet and that the data packet can not be forwarded at this time.