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An infomercial is a form of television commercial, which generally includes a phone number or website. Most often used as a form of direct response television (DRTV), long-form infomercials are typically 28:30 or 58:30 minutes in length. Infomercials are also known as paid programming (or teleshopping in Europe). This phenomenon started in the United States, where infomercials were typically shown overnight (usually 2:00 a.m. to 6:00 a.m.), outside of peak prime time hours for commercial broadcasters. Some television stations chose to air infomercials as an alternative to the former practice of signing off. By 2009, most infomercial spending in the U.S. occurs during the early morning, daytime and evening hours. Stations in most countries around the world have instituted similar media structures. The infomercial industry is worth over $200 billion.

While the term "infomercial" was originally applied only to television advertising, it is now sometimes used to refer to any presentation (often on video) which presents a significant amount of information in an actual, or perceived, attempt to promote a point of view. When used this way, the term may be meant to carry an implication that the party making the communication is exaggerating truths or hiding important facts. Often, it is unclear whether the actual presentation fits this definition because the term is used in an attempt to discredit the presentation. Hence, political speeches or conventions may be derogatorily referred to as "infomercials" for a specific point of view.