Hi
Ethernet controller is a hardware built in connected to your motherboard and NIC (network interface card ) is a device that you can use if the motherboard does not have a built in Ethernet controler.If the motherboard of your computer do not ahve a built ethernet controler you should
go to your nearest store of computer parts where you can purchase it . Ethernet controller and NIC are devices that will provide your computer to have an access to connect from router,pc,modem etc. going to your computer using the Ethernet cable.

ABOVE IS A SAMPLE OF NETWORK INTERFACE CARD

ABOVE IS A SAMPLE OF ETHERNET CORD
Hope my solution will provide you an idea about what your looking for .
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