What purpose do bicycle hubs serve?

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Ajd245246

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I have a 2007 kona coiler with a Front hub KK Disc 20mm
and Rear hub Shimano FH-M475 disc, im not quite sure what they actually do though. And they are the thing in the middle of the wheel right?
So....
1.) Where are they found on the bike?
2.) What purpose do they serve?

~~Thanks
 
1) The hubs are found in the middle of the wheel, looks like a cylinder almost. That's on the front and rear wheels.

2) A hub is the center part of a bicycle wheel. It consists of an axle, bearings and a hub shell. The hub shell typically has 2 machined metal flanges to which spokes can be attached. Hub shells can be one-piece with press-in cartridge or free bearings or, in the case of older designs, the flanges may be affixed to as separate hub shell.
 
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