A navigation bar is a user interface element that helps visitors find their way around a website or application. It typically contains links to the main sections or pages, allowing users to easily access content. Navigation bars can be found at the top, side, or bottom of a webpage and may include dropdown menus for additional options. These bars are essential for enhancing user experience, as they provide a clear structure and organization. A well-designed navigation bar improves usability by making it easier for users to locate information quickly, which can lead to increased engagement and satisfaction with the site or app.