Commercial distributors of Linux include:
Canonical, LTD (makers of Ubuntu)
Novell (makers of SUSE)
Red Hat (makers of Red Hat Enterprise Linux)
Xandros, Inc (makers of Xandros)
Other distros include:
Debian
Fedora
Slackware
Linux from Scratch
For desktop computers, Canonical's Ubuntu, Linux Mint and Fedora are all very strong distributors for the operating system while for laptops, Fuduntu is a well known and good distributor for Linux.
Linux is a monolithic kernel. Some operating systems with a microkernel use Linux as a process for providing drivers, but this is irrelevant to mainstream Linux.
Some of the topics that are covered in the Linux support forums are installing Linux, general questions and answer about Linux, as well as basic configurations.
Android is a Linux based operating system means you are already running Linux over your smart device ! And you can switch Android with some other Linux version !
The short answer is that Linux is a computer operating system, and is an alternative to older products such as DOS, Windows, MacOS or UNIX. The way that Linux is written and distributed is new and revolutionary - it is maintained by an open community of programmers and you can get it for free. This has created a growing industry of distributors who bundle Linux and other useful stuff into a distribution package or distro, to make life easy for the end user. This method of development and distribution is protected by an equally revolutionary license, the GNU Public License
Linux is just an OS (Operating system like macOS, android, Windows...). But the different things are that Linux is a bit hard to learn. Linux is used by hackers (Linux is a "hacking machine", a bit like hacking in movies. And yes u can play games on Linux (There is some games that doesn't support Linux.)
There are many distributors of health care products around the work. Some examples of these in the UK are Bullen, Aegis, Impectron Ltd and Alliance Healthcare.
While Red Hat uses strict trademark rules to restrict free re-distribution of their officially supported versions of Red Hat Enterprise Linux, Red Hat freely provides the source code for the distribution's software even for software where this is not mandatory. As a result, several distributors have created re-branded and/or community-supported re-builds of Red Hat Enterprise Linux that can legally be made available, without official support from Red Hat. CentOS,Scientific Linux, and Oracle Linux aim to provide 100% compatibility with Red Hat Enterprise Linux.
Some people refers to Linux-based systems as "GNU/Linux" if they use software written fr the GNU operating system.
It is a CD the has some form of Linux, an operating system for your computer (Microsoft Windows is an operating system). There are CDs of Linux that are just used to install Linux, or there are LiveCDs that you just put in and reboot. Linux will be running without effecting the rest of the computer.
Linux itself can't help you get a job. Being familiar with Linux and having certifications in various aspects can help you get some jobs.
Yes, OpenOffice.org can run on Linux and some like Ubuntu include this office program.