What is the difference between an Ethernet hub and switch

HUB:The term ‘hub’ is sometimes used to refer to any piece of network equipment that connects PCs together, but it actually refers to a multi-port repeater. This type of device simply passes on all the information it receives, so that all devices connected to its ports receive that information.

When a hub receives a packet of data at one of its ports from a PC on the network, it transmits the packet to all of its ports and, thus, to all of the other PCs on the network.

a hub retransmits data from one PC to all of the PCs, the maximum bandwidth is 100 Mhz and that bandwidth is shared by all of the PC's connected to the hub.

SWITCH:Switches control the flow of network traffic based on the address information in each packet. A switch learns which devices are connected to its ports and then forwards on packets to the appropriate port only. This allows simultaneous communication across the switch, improving bandwidth.

This switching operation reduces the amount of unnecessary traffic that would have occurred if the same information had been sent from every port.