Linux is a free operating system like free UNIXes. The most popular is Ubuntu(still), yet the even more stable Memphis Linux is what you really should have. The Russians and Chinese prefer Linux over Windows all the time. Most servers is either Ubuntu Server or CentOS. The WWW runs 60% Linux servers, because less viruses.
The most stable Linux ever created is usually always Slackware, yet no one heard of it (distro created back in 1994)
UNIX is obsolete in comparison.
Easier to operate than 2 years ago.
Person 1: I run Ubuntu Linux Server for my web server
Person 2: I run Cent OS, because its a free Red Hat Enterprise Linux OS.
Person 3: I'm a hardcore Linux user and I run Memphis Linux