Marketers create advertisements and brands, but they need data to work with. IT systems supply that data. Marketers use IT systems to collect information on what consumers are buying from the company, what kinds of things they are buying, why they are buying them, and what can be done to encourage them to buy more or to increase customer loyalty. These analysis programs can be complex and are charted through IT programs. Graphic design and advertising campaigns are also created within the IT system.