Target group refers to the key consumer demographic for a brand's products or services. Universe refers to the total number of individuals in the target group. Rating points represent the percentage of the target audience or total individuals exposed to a TV or radio spot. Gross rating points (GRPs) are the total ratings achieved against all individuals, while target rating points (TRPs) are the ratings achieved against just the target audience. Reach refers to the percentage of the target universe exposed to an advertising campaign at least once over a set time period. Frequency refers to the average number of times each person in the reach saw the advertising. Setting reach and frequency goals is important for media planning. Cost per GRP/TR