A hub may refer to any of the following:
1. When referring to a network, a hub is the most basic networking device that connects multiple computers or other network devices together. Unlike a network switch or router, a network hub has no routing tables or intelligence on where to send information and broadcasts all network data across each connection. Most hubs can detect basic network errors, such as collisions, but having all information broadcast to multiple ports is a security risk and causes bottlenecks. In the past, network hubs were popular because they were cheaper than a switch or router. Today, switches do not cost much more than a hub and are a much better solution for any network.
Do hubs have an IP address?
No. A hub is a basic (dumb device) and does not need an IP address.
2. In general, a hub refers to a hardware device that enables multiple devices or connections to connect to a computer. An example is a USB hub, which allows multiple USB devices to connect to one computer, even though that computer may only have a few USB connections. Pictured is an example of a USB hub.
In the Device Manager, the root hub is your computer and the first USB hub.
Another example of a hub is a FireWire hub, which allows multiple FireWire devices to connect to a computer.