networking - What does it mean whether network device is Loopback?

Does it mean that the Loopback device handles the request like ping localhost ?

If so, there should be at least one device that's loopback,but seems none of my two network device is Loopback:

rpcap://\Device\NPF_{45D5ADA0-095E-49F3-BEA1-E8754390F2D4}
        Description: Network adapter 'Intel(R) PRO/Wireless 2200BG Network Conne
ction (Microsoft's Packet Scheduler) ' on local host
        Loopback: no

rpcap://\Device\NPF_{783C5467-4026-473C-86A0-5E5A3708C624}
        Description: Network adapter 'Realtek RTL8169/8110 Family Gigabit Ethern
et NIC                                 (Microsoft's Packet Scheduler) ' on local
 host
        Loopback: no

Can someone clarify all this?