Final answer:
The conversion rate is the metric that tells you how often an ad click or interaction leads to a conversion.
Step-by-step explanation:
The metric that tells you how often, on average, an ad click or other ad interaction leads to a conversion is the conversion rate. The conversion rate is calculated by dividing the number of conversions by the number of clicks or interactions and multiplying by 100 to get a percentage. It is an important metric for measuring the effectiveness of advertising campaigns and optimizing them for higher conversions.