Re: In terms of internet..
Yes and no....
Copper cable:
Supports maximum 1Gbit/sec in speeds due to the need for repeaters ( also known as mini hubs ) as the signal is not transferred long and strongly enough compared to other choices. Only the newest copper cables supporting Ethernet 5.0 are able to carry this speed.
Optical fibre:
Will typically support 10-20 Gbit/sec and needs fewer hubs due to the signal not being electrical but made of light. Some cables have been proven to support up to 400 Gbit/sec but a speed of 100 Gbit are more common.
It makes absolutely no sense to keep copper as the main wire unless its to save money from having to rebury new wire. It is possible to use copper to the mini hubs and then optical fibre from there - but you will stunt the network some and will probably not get speeds over 10mbit for the individual users.
In Sweden they use a fibre optic network that supports up 10gbit for individual users - its not a coincidence that Piratebay was born in Sweden ya know.... 
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