A featured image is a specific image that represents a post, page, or custom post type in WordPress. It is also known as a post thumbnail, and it can be used to grab the attention of the reader, provide visual context for the content, and make the content more shareable on social media.
When you set a featured image for a post or page, it will typically appear in the header or top of the post, depending on the theme you are using. Some themes may also use the featured image in other areas, such as the homepage, archives, or related posts section.
To set a featured image in WordPress, you can click on the “set featured image” link in the editor and select an image from your media library or upload a new one. Once you have selected the image, you can crop and scale it to fit the dimensions of the theme and save it as the featured image for that post or page.