The "Page Up" and "Page Down" keys are commonly found on computer keyboards. They allow users to quickly navigate through documents, web pages, or other content without using a mouse. Pressing the "Page Up" key scrolls the view upward, while the "Page Down" key scrolls it downward, moving the content by a set amount, typically one screen at a time. These keys are especially useful for reading long texts or browsing through large datasets. They enhance efficiency by enabling users to jump through sections quickly, making it easier to find specific information within documents or applications like Microsoft Word or web browsers.