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Linux in narrower sense ...

... is "only" the kernel of a UNIX like Operating System, developped by Linus Thorvalds and hunderts of volentiers. The kernel of it's own is not yet really useful. In order to get a complete Operating System you need a lot of additional programs (so called system - binaries). As most of those programs originate from GNU (resp. the FSF) one often talks of GNU/Linux Systems.
A simplyfied formula:
GNU Software + Linux Kernel = Operating System

Linux in wider sense ...

... is not a single Operating System, but a collective term for all Operating Systems using the Linux Kernel. Most ( quite likely all ) of those Systeme get the most of their Systembinaries from GNU, and are therefor GNU/Linux Systems.
A complete Operating System based on GNU/Linux is called a Distribution.
These GNU/Linux Distributions are maintained by several Mnaufacturers (Distributors) and sometimes differ greatly in size and usability.

GNU/Linux Distributions are available for most Processor Architectures:

The IBM - PC , the Apple , the Amiga, for DEC-Alpha, MIPS and SUN Workstations, even for Mini PCs like the Palm Pilot. (these are only some examples)

There are GNU/Linux Distributiones in many shades:

starting with Mini Distributions that fit on one single diskette:

TomsRTBT (one single diskette) specially tailored for data resque and network diagnosis.
µLinux ( one up to three diskette(s) ) contains an amazing amount of programs, X - Window, E - Mail etc... , good for old PCs (starting from 386, 2MB).

continuing with big Distributions, delivered on several CD-ROMs:

Debian GNU/Linux - a mature Distribution, contains free Software only

 

up to Distributiones for Supercomputers (computer farms so called Clusters) :

 

Rocks