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Computer monitors are electronic devices primarily used in conjunction with computers to display visual content. They serve as an interface between the computer's processing unit and the user, presenting images, text, and video in a visually understandable format. Monitors come in various sizes, resolutions, and technologies such as LCD, LED, and OLED, each offering different benefits in terms of color accuracy, brightness, contrast, and energy efficiency. They are considered computer accessories due to their role in enhancing the user experience, but they are distinct from data storage devices and computer cases which primarily serve functional purposes related to information retention and system protection respectively.