When drawn on paper, this is a 2D representation of the three dimensions. For example, when you draw a cube on a sheet of paper, this is still 2D, but it is a 3D representation, unlike a drawing of a square. 3D movies are labeled as 3 dimensional, but they are really just a 3D representation of a 2D object.
In July 2010, CentOS overtook Debian to become the most popular Linux distribution for web servers, with almost 30% of all Linux web servers using it. Debian retook the lead in January 2012.
Following with the release of RHEL 6.5, CentOS 6.5 has arrived on 1st Dec and its time to play with it. For those who want to update their existing 6.4 systems to 6.5 simply use the yum update command and all the magic would be done. CentOS 6.5 has received some package updates as well as new features.