VLAN's are like a party where different groups of people each speak their very own cryptic language that the other groups cannot understand. They know there is something being said but have no way of understanding it without the words first going through an interpreter (router) that would translate the language into the one they are speaking. Say the party has 20 people attending, there are 4 groups of 5 people in each group and each one of those groups speak their own cryptic language with a distinctive dialect which is like a VLAN tag. That distinctive dialect is what the interpreter (router) would use to translate to the other groups or that a switch would use to keep that traffic within speakers of the same dialect. That is VLAN's in a nutshell.
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