How does the terminal name the network interfaces?

I want to know the logic of the bash terminal for name the network interfaces. When I do an ifconfig there are showed multiples interfaces and I don't know which one is the WiFI, which one the Ethernet...
Thank you!

When I do an ifconfig I get this output:
lo0 Guess this is the loopback address
gif0 Don't know what is this
stf0 Don't know what is this
en0 Is the network, now in my case the wifi
en1 & en2 Guess, reading your explanation that this are the ethernet thunderbolt ports
p2p0 Don't know what is this
awd10 Don't know what is this
bridge0 Don't know what is this
Do you know what are this interfaces? If it helps I have VMware Fusion and VirtualBox installed.

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