Definition: Sidebar.php: A script used by some web browsers to display an external page, such as a JavaScript file or a stylesheet. Definition: In programming languages like PHP, a sidebar.php script displays content that can be accessed by clicking on links inside it, allowing users to interact with the site without having to scroll through all its pages. This feature is common in websites where the site's primary content is structured differently from the rest of the website (such as a blog or forum). In many cases, these scripts are used for navigation and to make the site look more visually appealing or functional.