Compounds. There are more carbon compounds than there are compounds of all other elements combined. The study of carbon compounds, both natural and synthetic, is called organic chemistry. Plastics, foods, textiles, and many other common substances contain carbon.
backplane is the shared capacity between interfaces on a switch switch fabric is also the shared capacity between interfaces on a switch and can also be the shared capacity between interfaces on multiple switches using some sort of interconnect, typically vendor specific.
Some people use the term midplane to describe a board that sits between and connects a hard drive hot-swap backplane and redundant power supplies. Backplanes in storage. Servers commonly have a backplane to attach hot swappable hard drives; backplane pins pass directly into hard drive sockets without cables.