The usage share of operating systems is the percentage market share of the operating systems used in computers. Different categories of computers use a wide variety of operating systems, so the total usage share varies enormously from one category to another. In certain categories, one family of operating systems dominates, for example, most desktop and laptop computers use Microsoft Windows, while most supercomputers use Linux. In other categories, such as smartphones and servers, there is more diversity and competition. Data about operating system share is difficult to obtain, since i...