Marketers play a central role in connecting products and services to customers. Quickly fine-tuning positioning, messaging, and campaigns to align with the ever-changing needs of customers, marketers must still balance business priorities like improving brand reputation, increasing customer loyalty, generating demand, driving revenue, and much more. 
As marketers, we traditionally rely on data to guide our decisions. We run A/B tests. We use robust analytics tools. We find out where customers are converting, and where they're not. We know exactly what our customers are doing.