What is a Widget Area?
A widget area is a designated place where widgets can appear on your website. These spaces are customized by your theme but are typically sidebars or footers.
More About Widget Areas
To start featuring widgets on your WordPress website, you’ll need to choose what to include in your widget area. Most themes support widget areas in the sidebar and footer of your web pages. However, some let you add widgets below or above content areas and the header.
You can edit your widget areas by going to Appearance > Customizer > Widgets. You can also navigate to Appearance > Widgets. Once you do this, you can add widgets to any area supported by your theme. If you need to add additional widget areas, you can add code to your theme template files.