Advertising is a type of marketing communication used by companies to encourage the selling of their products and services. Types of advertising include television advertisement, desktop online advertising, newspaper advertising, commercials, mobile advertising, outdoor advertising, radio advertising, flyering, magazine advertising and virtual advertising. Other methods include domain name advertising commonly done through web search engines, product placement and covert advertising, which places products or brands in the media, general press advertising, in-store advertising and billboard advertising. An advertising agency often takes control of the marketing and advertising of products for another company. They can often run marketing campaigns and use all social media and press to promote sales.