A Documentary—sometimes called a branded documentary, promotional documentary, or even a corporate brand film—is a video filmed in documentary style. As a versatile video style, it can be useful for public relations (PR) announcements, marketing efforts, and promotional campaigns. 

 Narrative voice is the perspective the story is told from.  An explainer video is a short video that's either animated, a whiteboard, live-action, screencast, or company about-us style ranging from 90 seconds to 3 minutes. 

 A Television or Radio advertisement is a span of television or radio programming produced and paid for by an organization. It conveys a message promoting, and aiming to market, a product, service or idea.

 Eloquence and elegance is key, as well as a masterful command of speaking, keeping the audience spellbound and at the same time entertained whilst everything goes to schedule.