As things become more popular and their usage widens, they often fragment into smaller, more specific versions of the same thing. There are examples across genres and entire forms of expression. Once there was a time when you could just listen to metal. Now you have to listen to thrash metal, or melodic death metal, or emo-core groove metal.
The same is true of video.
PR’s and marketers distinguish between several different types of video, and the dichotomy is a meaningful one insofar as separating strategic aims. You can make explainer videos, company culture videos, vlogs, testimonials, traditional advertisements, and today’s topic of conversation: branded video.