Organizations that deliver content or a service to an audience/users. Publishers may depend on selling advertising to generate revenue to fund the development and delivery of content or services. Publishers have traditionally directly sold their best quality advertising spots or space, whereas those that can’t or can’t cost-effectively be sold directly are often sold through third party resellers such as ad networks, supply-side platform or ad exchanges (electronic marketplaces) on their behalf. As marketers move more and more toward automated or programmatic media buying, so are publishers as they are adapting and learning how to effectively list their ad inventory in programmatic channels.