The media browser lets you browse photos and music on your computer to make it easy to add them to your documents.
The media browser allows you to browse for photos in your media libraries such as iPhoto (Mac OS), Aperture (Mac OS), and Adobe Lightroom. You can also see photos in your Pictures folder.
The media browser allows you to browse for music in your iTunes library, your Music folder, and also shows any iLife (Mac OS) or iMovie (Mac OS) sound effects that you have installed.