Text includes all alphanumeric characters-letters, numbers, graphical characters, and punctuation.
Audio content includes all voice and vocal communication, as well as music, sound effects, and any other content that can be carried and output as sound. Moving image includes video, film, animation, and other forms of apparent motion. Still image includes all forms of graphics, including facsimile, or fax. Finally, raw data can be defined as anything not covered under the other types of content. This would include any content requiring a computer program to process it at the other end.