Infomercials as defined by wikipedia:
Infomercials (or informercials) are tvadvertisement commercials that run for durations ranging from a minute to as long as a typical television program. Companies of all sizes use infomercials to get their message out there. Infomercials are also known as paid programming (or teleshopping in Europe). Originally, they were typically shown overnight (usually 2:00 a.m. to 6:00 a.m.) — outside of peak hours. Some television stations chose to air such programming as an alternative to the former practice of sign-off. By 2008, most infomercial spending is during early morning, daytime, and evening hours.
You can learn more about infomercials by visiting drtv101.com