9 Downloadable and recorded computer software for use as a data management platform (DMP), to develop trading strategies, to download and display advertising, to purchase digital advertising, to purchase advertising in an automated fashion, including through use of a demand side platform (DSP), to sell advertising in an automated fashion, including through use of a supply side platform (SSP), for use as cross-site advertiser analytics, for use as single-site publisher analytics, for use in real-time bidding, to build, operate and evolve real-time trading platforms all for use in the field of on-line advertising and real time media trading; downloadable and recorded software for use as a data management platform (DMP), to develop trading strategies, to download and display advertising, to purchase digital advertising, to purchase advertising in an automated fashion, including through use of a demand side platform (DSP), to sell advertising in an automated fashion, including through use of a supply side platform (SSP), for use as cross-site advertiser analytics, for use as single-site publisher analytics, for use in real-time bidding, to build, operate and evolve real-time trading platforms all for use in the field of on-line advertising and real time media trading; downloadable computer programs, recorded, for use as a data management platform (DMP), to develop trading strategies, to download and display advertising, to purchase digital advertising, to purchase advertising in an automated fashion, including through use of a demand side platform (DSP), to sell advertising in an automated fashion, including through use of a supply side platform (SSP), for use as cross-site advertiser analytics, for use as single-site publisher analytics, for use in real-time bidding, to build, operate and evolve real-time trading platforms all for use in the field of on-line advertising and realtime media trading; downloadable and recorded computer software platforms for on-line advertising and real-time media trading