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.
The Raspbian operating system is a Debian based GNU/Linux distribution that targets the Raspberry Pi board. It can be convenient to play around with the OS without the need for a Rasberry Pi or an SD card. For this, we want to run it on the QEMU virtual machine.