A commercial or promotional video is a type of advertising that is commonly produced for social media or other parts of the internet. It is designed as a teaser for your company's service or product. It doesn't go into detail, but rather gives your potential customers an overview of what your company does.
An institutional film is for internal or external communication of a company, association, institution, or group.
An institutional film may be intended for different audiences, such as the company's staff, its shareholders, its suppliers, or even its customers.