This document discusses audio information and media. It defines audio as sound, especially recorded or transmitted sound. Audio media refers to communication using sound recordings to transfer information. The document then describes different types of audio information like radio broadcasts, music, sound recordings and audio podcasts. It also discusses various formats for storing audio like tapes, CDs, USB drives and online storage. Common audio file formats like MP3, M4A, WAV and WMA are also outlined. Finally, the document covers elements of sound design, principles of sound design and types of audio transitions.