What is a WordPress Sidebar? A sidebar is a widgetized portion of a WordPress website in which content not found on the homepage can be displayed. Widgets are used to bring secondary material to a website. For example, a widget can display a list of recently posted blogs, a tag cloud, or a search bar.The WordPress sidebar can be changed based on the page on which it appears, or it can be populated with the same content on each page. Administrators can use sidebars throughout the site, or they can structure them for different pages and themes...