
A desktop computer is a personal computer (PC) in a form intended for regular use at a single location, as opposed to a mobile laptop or portable computer.
Desktop and tower computers are two different styles of computer case that use desk space in varying ways. Some Desktop computers are designed to lay flat on the desk, while towers stand upright and are sometimes mounted underneath the desk or stand independently on the floor.
Prior to the widespread use of microprocessors, a computer that could fit on a desk was considered remarkably small. "Desktop" indicates a horizontally-oriented computer case usually intended to have the display screen placed on top to save space on the desktop. Most modern desktop computers have separate screens and keyboards and some newer models have all hardware, built into one package. These computers are desktop computers that combine the monitor into the same case as the CPU, and are called All-in-One.
Tower cases are sometimes incorrectly called desktop computers as some will locate them on a desk instead of on the floor under the desk. Cases intended for home theater PC systems are usually considered to be desktop cases in both senses, regardless of orientation and placement.
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