An ethernet hub is an electronic device that runs a computer network. It is a simple device and is easy to configure. A hub acts like a repeater: all data that arrives to one port is sent to all other ports (without looking at IP address for the data's destination). That means that all devices in this network will get all data. A hub is very simple device and does not operate Ethernet traffic. In contrast, a switch hub has a lower latency. Many hubs have LED signal lamps to show the state of the hub (which ports are connected and if the hub working). A "collision" happens when two or more devices on the same network try to send packets at the same time. When collisions happen all of the devices have to go through a routine to resolve the conflict. The process is set in the Ethernet Carrier Sense Multiple Access with Collision Detection (CSMA/CD) protocol.
Some hubs may also come with a BNC and/or Attachment Unit Interface (AUI) connector to allow connection to legacy 10BASE2 or 10BASE5 network segments.

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