That includes images, video, audio files, PDF files, documents, and so on. You edit media files in the “Media” tab in the administration panel, and they can be embedded into pages, posts and other content types on the site. You can upload them either in Media → Add New in the left sidebar, or by clicking the “Add Media” button while editing a post or page.
Media
Media is the collective name for all types of content that you upload to your WordPress site.