A narrow, vertical column on the right or left side of a WordPress theme that’s typically used for navigation. Sidebars usually link to other pages on the same website. They may also display a photo of the site owner, a brief bio, social media content, or advertisements. The sidebar for a WordPress blog may contain links to posts by date, category or tag.
Advanced users can customize the sidebar to add or remove content, For example, some administrators may want to add blogrolls, “next post” and “previous post” links, or links to author profiles.