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. For example, financial institutions often transmit raw data and computers interpret the data at the other end. What they are doing is confusing directionality with simultaneity.
All communication is either simultaneous or non-simultaneous.
This attribute is not a continuum from simultaneity to non-simultaneity. Simultaneous communication implies that the message is created and presented at the same time. Examples include face to face interactions, telephone conversations, and live radio or television. All forms of stored messages are, by definition, non-simultaneous communication. The two primary types of conduit are wired are wireless.