1.3 OK, now I know what Debian is... what is Linux?!
In short, Linux is the kernel of a Unix-like operating system. It was
originally designed for 386 (and better) PCs; today Linux also runs on a dozen
of other systems. Linux is written by Linus Torvalds and many computer
scientists around the world.
Besides its kernel, a "Linux" system usually has:
a wide range of Unix utilities, many of which have been developed by the GNU
project and the Free Software Foundation.
The combination of the Linux kernel, the file system, the GNU and FSF
utilities, and the other utilities are designed to achieve compliance with the
POSIX (IEEE 1003.1) standard; see
source code compatible is Debian with other Unix systems?, Section 3.3.
For more information about Linux, see Michael K. Johnson's