According to Facebook, your Relevancy score is determined by the high number of positive interactions that your ad gains. This score is constantly updated as more people share positive feedback. The reasons listed below are why the Relevancy score matters. It can lower the costs that you have to pay to reach the right kind of target audience. It can help advertisers to test a varied combination of ad creative strategies with different audiences to figure out which one works best to deliver a higher Relevancy score. It is an effective approach towards optimizing campaigns that are already in progress. However, when using the Relevancy score it is essential to understand that it is not an indicator of how your ad campaign is performing. Instead, it should be used as a way to reach your target audience at lower costs. Moreover, it can be used as a benchmark to test and retest your ad creative and ad targeting strategies.