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A VLAN (Virtual Local Area Network) creates logically separate networks on top of the same physical hardware, without needing separate physical switches.
Why Not Just Use Physical Separation?
Running separate physical networks for every isolation need would be expensive and inflexible — VLANs achieve the same isolation in software, at a fraction of the cost.
Common Use Cases
Separating a hosting provider's customer traffic from internal management traffic, or isolating different departments' devices on a corporate network, are typical VLAN applications.
Do You Need One?
Most hosting customers never configure VLANs directly — it's infrastructure-level networking handled by the hosting provider, relevant mainly to those managing multi-server private networks.
