Infomercial
An infomercial is a kind of advertisment. An infomercial is similar to a regular TV program, but it wants to promote a product or service. The word is made of two parts, information and commercial. Very often there's a way to directly respond, like a toll-free telephone number, or website, where the items can be ordered. Informercials are designd to produce a direct response, that can be measured.  They are often pre-recorded. They are shown when there are few people watching television, for example during the night.