Official IAB definition:
"A computer residing in the click transaction stream (for purposes of [the IAB Click Measurement Guidelines]) that manages data storage or network communication functions acting on behalf of another single browser or server, or multiple browsers or servers. Proxy servers can be authorized to send network communication (i.e., requests, re-directs, etc.) or content and/or substitute for other servers in the click transaction stream."
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Reviews of selected top internet advertising networks:
