Imagine that a network cable would actually be a gigantic tunnel. Imagine that all network traffic going thru that cable (or tunnel) would be a bunch of little people carrying messages from one side of the cable to the other side. Without VLAN, all the little people would see each others while traveling thru the tunnel, thus potentially having the risk that someone might see their message. With VLAN the tunnel is full of smaller tunnels (or corridors) which each messenger has to go thru. While in this smaller tunnel, there's no visibility to the other guys messages, because they're all in separate tunnels (unless another message is being carried in the same tunnel in purpose. At the end of the tunnel (or both ends) some tunnels might merge into one and others might just lead to a completely different place. Magical, isn't it?
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