I guess it's a pretty basic question and I tried to understand it by reading http://en.wikipedia.org/wiki/Gro... but I still don't really get it.
The "allowing the designer to ground anything without having to run multiple tracks" part is clear but the others are not so much.
I observed that various PCBs have, but others don't have a ground plane. Also, how usual it is to have a ground plane on one side and a power plane on the other side? What are the benefits? Is it supposed to lessen electrical noise? In what applications is it preferred?
I guess it's a lot of questions but I'm really interested about the answers.
Thanks in advance!