The "Page Up" key is a common feature found on computer keyboards. It allows users to quickly scroll up through documents, web pages, or other content without having to use a mouse. When pressed, it typically moves the view up one screen or page, making it easier to navigate large amounts of text. This key is often located near the top right of the keyboard, alongside other navigation keys like "Page Down," "Home," and "End." It is especially useful in applications like Microsoft Word or web browsers, where users frequently need to review lengthy information efficiently.