A sidebar is a column of content running alongside your main content, commonly used for things like a search box, recent posts, categories, or an author bio.
You’ve likely seen sidebars on countless blogs — usually appearing to the left or right of the main article, filled with widgets rather than the primary content itself.
Sidebars in Modern WordPress
Classic themes typically defined fixed sidebar areas you filled with widgets through the dashboard. Modern block themes handle this differently, letting you build sidebar-style layouts directly using Columns and Group blocks inside the editor itself.
Do You Even Need One?
Sidebars were once considered essential, but many modern designs skip them entirely in favor of a single, focused content column. Whether a sidebar helps or distracts really depends on your specific site and what you want visitors focused on.