What is the ETHERNET ADAPTOR?

I have switched to running my internet desktop Intel iMac with wireless. I was using an ethernet cable. That cable is now disconnected and it shows up in the network preference as disconnected. However in the network preference the "ethernet adaptor (en2)" shows active. What is the ethernet adaptor, why is it active and what does it do? Thanks.

Are you running parallels or the equivalent because that creates virtual network devices to trick windows into sharing the network with OS X.

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