This document discusses how analytics can help optimize marketing decisions. It emphasizes using data from web analytics, experiments, and metrics to understand customer behavior, test hypotheses, and measure the impact of marketing campaigns. Examples are given of how analytics revealed improvements for a client, including increased online bidding, bids, and bid values following implementation of Google Analytics and digital advertising changes. The importance of testing hypotheses, analyzing results, and continuously improving based on data and the "scientific method" is stressed.