Promo videos are usually short advertising videos that promote your company, product or service. Such videos should get people excited about what you do.
The main goal of the promo video is to strengthen brand awareness and grab the attention of potential customers. They are not aimed to tell what you do and how you do it, or how to use a product like an explainer video would.
In most cases, a promo video is shorter than 30 seconds. It is a highly branded piece of content with a strong call to action at the end.
Promo videos are perfectly suitable for social media ads, Youtube pre-roll advertising, or TV advertising.