Desktop computer is popularly known as personal computer (PC). As the name suggest, it is generally small in size and fitted on the top of a desk which can be used at a fixed location. Most of modern desktop computer has separate screens and keyboards. Generally in majority of the PCs, Microsoft Windows, LINUX and Mac OS x are used as operating system. Desktop computers are available in many different forms from large vertical tower cases to small form factor models. Advantages of desktop computer are that it may be used for day to day computational and internet communication activities of office, school etc. A PC provides more space for heat to escape. Also power consumption of a PC is not very high. There are many brands of PCs are available in Indian market and abroad including HP, HCL, Wipro, Compaq etc. A PC also can be assembled as per specific requirements, instead of a particular brand.