SparkFun Electronics Forum

Hello,
I am sorry. I am new to PCB. And just want to know what is ground copper and what is trace copper.
It will be really helpful for me if anyone show it by real image. Thanks a lot in advance for your kind help.

https://learn.sparkfun.com/tutorials/pcb-basics
http://en.wikipedia.org/wiki/Printed_circuit_board
http://en.wikipedia.org/wiki/Signal_trace
http://en.wikipedia.org/wiki/Ground_pla ... uit_boards