Radio Drama as a Form

"Radio Drama is a form of audio storytelling broadcast on radio. With no visual component radio drama depends on dialogue, music and sound effects to help the listener imagine the story."
Wikepedia

When listing to radio you have to be able to imagine what you are hearing, as you cant physically see it. One of the main conventions of a radio drama is that they have to give huge descriptions, so the viewer can imagine, things such as clothes, scenery, and characters without just listing what somebody is wearing.

Sound is an important element of radio drama as unlike television, you cant see the characters expressions or movements, through sound effects, music and narrator you have to no everything about the characters. Sound effects are often used to fill gaps, and set the scene. Music is usually used to create tension, or suspense and to signify the beginning and end of the drama. Narrators are often used to pass time, and establish the story.