Even though it may seem to you that a desktop is merely a desktop as opposed to a laptop, desktops are different not only in size, but in function, performance and capability.
According to ‘turbofuture.com’ there are different areas where desktop computers function differently.
The Supercomputers are more powerful and faster in processing than the other desktops.
Mainframe computers are very useful for companies to store a huge amount of data, mini computers are not as large and bulky and are usually dedicated to engineering field as well as the medical field and for the processing of sales and other suchlike functions.
Popular examples of desktop computers are Apple, Dell, HP, Lenovo and Acer with other makes that people prefer.