What does GRP mean in News & Media?

Gross rating point

In advertising, a gross rating point (GRP) is a measure of the size of an advertising campaign by a specific medium or schedule. It does not measure the size of the audience reached. Rather, GRPs quantify impressions as a percentage of the target population, thus this percentage may be greater, or in fact much greater, than 100. Target rating points express the same concept, but with regard to a more narrowly defined target audience.GRPs are used predominantly as a measure of media with high potential exposures or impressions. Nielsen Media Research is an example of a company which uses GRPs.

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