A navigation bar is a user interface element that helps visitors find their way around a website or application. It typically appears at the top or side of a page and contains links to important sections, such as Home, About Us, Services, and Contact. This organized layout allows users to quickly access different parts of the site without confusion. Navigation bars can be horizontal or vertical, depending on the design of the website. They may also include dropdown menus for additional options, enhancing user experience. Effective navigation bars are essential for improving site usability and keeping visitors engaged.