Terminology.

Composition: this is the placement of visual elements (objects). Objects are often placed in a certain way for a certain effect. For example:
 The main elements of this photo are the shark and the girl. The rule of thirds has been used in this image as the girl is in the bottom left third, making her appear small and vulnerable. The shark is placed slightly behind the girl and takes up the majority of the rest of the image to show how large and powerful it is. It has been made even bigger by having its mouth open; this shows he is going to attack and cause harm. The title is in bold and placed in the bottom right third; this demonstrates how the title is important but not as important as the shark.
It can also be the creation of a piece of music.


Editing: this is the process of selecting and preparing images, text, video and audio and putting them all together; correcting them; modifying them and creating a final piece that is presentable to an audience. Editing in terms of film is often the preparation of film and something audio files and placing them together. Audio can add to the tension of the actions in the film. Editing is an effective process in making something look professional and presentable.


Sound: this is a travelling wave that can be heard by humans and animals. Sound in the terms of media is often in the form of audio files which can be used in the editing process to add tension or emotion to a scene. Certain instruments are used to create these effects, string instruments can be used to make a scene feel sad or scary. Drums are often used to add tension and drama. Sound can create a mood in a scene.

Diegetic sound is that of the sound that is present on screen that has not been added in. For example, if you were at the actual scene you would be able to hear that sound (e.g. a door closing, a cough). However, non-diegetic sound is that of the sound that is present on screen that had been added in. For example, a violin playing dramatic music would be added in after the scene was recorded, there would not be someone playing the dramatic music whilst filming was taking place.


These three can all interlink in a scene where, for example, a shark could be going in to attack someone. The composition could be the shark behind the unsuspecting victim, the sound could be loud and adding suspense and drama (a typical instrument could be a string instrument or keyboard) and they could be edited to fit together to make the scene more effective.