Ad sales partner specializing primarily in single-site sales.
Rep firms, short for site representation firms, act as an outsourced advertising sales force. Rep firms focus on high-traffic, well-branded sites. Given the amount of focus on individual sites, participants must have sufficient ad inventory to justify representation. Exclusive representation is often required.
see also: Digital Marketing Tools
Ad Networks and Rep Firms: Know the Difference
ClickZ (November 6, 2000)