These fields may further create derivative fields, such as a movie review section in a newspaper or a television guide. Sub-industries can spin off from film, such as popcorn makers, and film-related toys (e.g., "Star Wars" figures). Sub-industries of pre-existing industries may deal specifically with film, such as product placement and other advertising within films. The terminology used for describing motion pictures varies considerably between British and American English. In British usage, the name of the medium is "film". The word "movie" is understood but seldom used. Additionally, "the pictures" (plural) is used semi-frequently to refer to the place where movies are exhibited, while in American English this may be called "the movies", but it is becoming outdated. In other countries, the place where movies are exhibited may be called a cinema or movie theatre. By contrast, in the United States, "movie" is the predominant form. Although the words "film" and "movie" are sometimes used interchangeably, "film" is more often used when considering artistic, theoretical, or technical aspects. The term "movies" more often refers to entertainment or commercial aspects, as where to go for fun evening on a date. For example, a book titled "How to Understand a Film" would probably be about the aesthetics or theory of film, while a book entitled "Let's Go to the Movies" would probably be about the history of entertaining movies and blockbusters. Further terminology is used to distinguish various forms and media used in the film industry. "Motion pictures" and "moving pictures" are frequently used terms for film and movie productions specifically intended for theatrical exhibition, such as, for instance, "Batman". "DVD" and "videotape" are video formats that can reproduce a photochemical film. A reproduction based on such is called a "transfer." After the advent of theatrical film as an industry, the television industry began using videotape as a recording medium. For many decades, tape was solely an analog medium onto which moving images could be either recorded or transferred. "Film" and "filming" refer to the photochemical medium that chemically records a visual image and the act of recording respectively. However, the act of shooting images with other visual media, such as with a digital camera, is still called "filming" and the resulting works often called "films" as interchangeable to "movies," despite not being shot on film. "Silent films" need not be utterly silent, but are films and movies without an audible dialogue, including those that have a musical accompaniment.