What is

"Narration" is the act or process of narrating; a narrated account or story; narrative.

An active verb form is one like "breaks", "told", "will help". The subject of an active verb is usually the person or thing that does the action, or is responsible for what happens. Passive verb forms are made with (for example "is broken", "was told" or "will be helped"). The subject of a passive verb is is usually the person or thing that is affected by the action of the verb. Compare:

They sent John to prision for three years. [Active]

John was sent to prision for three years. [Passive]

In the second sentence (passive), it is emphasized that John was sent to prision (he was affected) for we do not really care about who did it. This is the main difference in usage.

Hope this helps!