Hi MD, "All models are wrong, but some are useful". What did the British statistician George Box mean when he wrote these now-famous words in 1976, and how is it relevant to you? Whenever we try understanding the world around us - be it our customers' behavior, or how stars circle the center of a galaxy, or how coronavirus affects the human body - we never have direct and full access to the underlying reality. Instead, what we have access to is only the data generated by the process that we want to understand. So, for example, we know that a customer clicked on one button but ignored the other one. Based on this data point, we now infer what sort of customer she must be and predict her needs are and how we can fulfill them. Notice that the data hasn't told you a lot - it's sterile, a mere bunch of numbers. But when you combine the fact that a customer clicked on the button with your assumptions about how people behave, y