A media item is composed of several fields and it always has a file attached to the Media field.
A media item is composed of several fields and it always has a file attached to the Media field. A media item can be an image, a document, a video, or an audio file.
In Sitecore, there is a difference between media files and media items. An image or video file that is stored on your computer is called a media file. When you upload the media file to the Sitecore Media Library, the file is attached to a media item and is from then on referred to as a media item.
A Media item can be:
Images — .jpg, .gif, .png and other formats.
Microsoft Word documents — .doc and .docx files.
Videos — .mpeg, .wmv and other formats.
Audio files — .mp3 and other audio formats.
You should store and manage your media items in the Media Library. To edit your media items, you can use the Sitecore tool the Image Editor for images or other applications that you have installed on your computer such as Photoshop or Microsoft Word for documents. You can open the Image Editor from the Sitecore Start menu.