narration

The act of recounting or relating in order the particulars of some action, occurrence, or affair; a narrating.

The film used voice-over narration to explain the story.

His calm narration made the documentary easy to follow.

That which is narrated or recounted; an orderly recital of the details and particulars of some transaction or event, or of a series of transactions or events; a story or narrative.

That part of an oration in which the speaker makes his or her statement of facts.