The research regarding a customer includes?

Question: The research regarding a customer includes?

Research in relation to a customer means that the business has general information about the customer, this simple information can be according to his age and interest towards the customer. According to today's research, research is done online, through which the customer's interest is revealed, and what kind of products the customer is interested in, and feedback can also be taken from them, how these products are according to them. It has become all online in today's era, as we see on any social media platform, that we are shown advertisements according to our interest.