Real Cost Per Mille (rCPM) represents the effective cost per thousand impressions after accounting for viewability. Unlike CPM, rCPM factors in how often ads are viewed, providing a more accurate cost measurement.

rCPM helps advertisers evaluate the true value of impressions, allowing them to optimize budgets by focusing on visible ad placements. Tracking rCPM ensures that ad spending is directed toward viewable impressions, improving campaign efficiency.