You can google the term and find the answer!!
Or you can read the <a href="http://searchnetworking.techtarget.com/sDefinition/0,,sid7_gci212294,00.html">hub</a> definition from whatis.com
A hub is a place of convergence where data arrives from one or more directions and is forwarded out in one or more other directions. A hub usually includes a switch of some kind. (And a product that is called a "switch" could usually be considered a hub as well.) The distinction seems to be that the hub is the place where data comes together and the switch is what determines how and where data is forwarded from the place where data comes together.
Here's a photo of a USB hub. You plug one end into your computer and then you can plug all your USB devices into the hub. It's kind of like a power strip for USB devices.
<img src="http://www.sz-wholesale.com/uploadFiles/upimg0/MARKSMAN-SIGMA-USB-HUB18437.jpg" alt="USB hub" />
Last Wiki Answer Submitted: October 1, 2007 4:34 pm by brianb008180 pts.
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The definition from whatis.com is theoretical and does not mention the physical attributes to devices that used to be deployed. Simply put in old school fashion, a hub is a dumb switch. Where a switch will direct the traffic to the port which it belongs by learning what IP address’s are on that port, a hub simply allows all traffic to go out every port, thus causing congestion on every port. No biggie on a very small network, but very troublesome the larger you get.
The definition from whatis.com is theoretical and does not mention the physical attributes to devices that used to be deployed. Simply put in old school fashion, a hub is a dumb switch. Where a switch will direct the traffic to the port which it belongs by learning what IP address’s are on that port, a hub simply allows all traffic to go out every port, thus causing congestion on every port. No biggie on a very small network, but very troublesome the larger you get.