What do marketers gain from gathering and analyzing information about customers and the needs and motivations of those customers?

What will be an ideal response?

To create value for customers and build meaningful relationships with them, marketers must first gain fresh, deep insights into what customers need and want. Such customer insights come from good marketing information. Companies use these customer insights to develop a competitive advantage.
Customer insights groups collect customer and market information from a wide variety of sources, ranging from traditional marketing research studies to mingling with and observing consumers to monitoring social media conversations about the company and its products. They mine big data from sources far and wide. Then they use this information to develop important customer insights from which the company can create more value for its customers.