A tremendous amount of money is spent on data for media buying decisions, specifically third-party audience data. Third-party data can come from many different sources, and multiple methodologies can be used in its collection, structuring, and marketing. This often makes it difficult for advertisers to understand exactly what they're buying, leaving advertisers at a disadvantage and at risk of purchasing data that's unsuitable for their purpose. To address this problem, advertisers need to evaluate the quality of a dataset before purchasing it.