Run-of-Network: "Ad buying option in which ad placements may appear on any pages on sites within an ad network." Basically means if an ad network has 500 sites, your ad will appear equally on all 500.
[FONT=Helvetica, Arial, Tahoma, sans-serif]RON stands for Run-of-Network[/FONT] [FONT=Helvetica, Arial, Tahoma, sans-serif]Definition: Ad buying option in which ad placements may appear on any pages on sites within an ad network.[/FONT]