Desktop ("desktop" in the literal sense) - a desktop computer that has a form factor that it is more convenient to have on the table (hence the use of the term "desktop" from the English. desktop - "work surface (desk)") home or office. Previously, this type of system units were typically wide and place on them was enough to place him on a CRT monitor. This in turn allows you to save space on your desktop, which was installed desktop. Naturally, this was taken into account by designers buildings that created the body for such system units that can withstand the weight of a CRT monitor. But as a result of the desktop was obtained at a price more expensive than "tower" system unit.
Desktops are used up to now, and still put on a desktop monitor. However, due to the decrease in size and weight of components and even more drastic reduction of weight and depth of the monitor (the modern "doskoobraznye" monitors - LCD monitor entirely - a relatively small weight and depth), it became possible to create and use a relatively cheap and compact desktops. As a result, the modern desktop is able to compete with the "tower" system unit is not only ergonomic but also by price. And so in terms of price / ergonomics desktop can now be even more profitable than in the "era of CRT," the acquisition. In particular, many firms produced thin desktop - desktops Slim (slim-desktop). Naturally, a thin desktop ergonomic than the traditional "thick" desktop, so almost no effect on the installation height of the monitor to be on it.