A Progress Bar is a visual indicator used in software applications to show the status of an ongoing process. It typically appears as a horizontal or vertical bar that fills up as the task progresses, providing users with a clear understanding of how much work has been completed and how much remains. This feature is commonly seen during file downloads, installations, or data uploads. Progress bars can vary in design, with some displaying percentage completion or estimated time remaining. They enhance user experience by reducing uncertainty and allowing users to gauge the duration of tasks. Common examples of progress bars can be found in operating systems like Windows and macOS, as well as in web applications.