Featured Image is a term used especially in content management systems such as WordPress and refers to the main image associated with content in a blog post, page or custom post type. This image is often used as a representative of the content and visually summarizes it.
Featured images are often used as a preview image of a post or page, meaning that it is featured wherever content is listed (homepage, category pages, social media posts, etc.). When used effectively, a featured image can increase the attractiveness and clickability of content, thus helping to attract more visitors.