Standard Rate and Data Service, which does business as SRDS, collects and distributes information on media advertising rates and other data of interest to advertisers and their media planning agencies. In addition to ad rates, it collects publishing dates and contact data on more than 100,000 media outlets in the US. SRDS offers information products tailored to customers in advertising, direct marketing, and public relations. In 2008 Nielsen traded SRDS to WPP in exchange for other assets. SRDS is part os WPP's global market research organization The Kantar Group.