You just bought a newLL Beanbackpack online for your kids to bring on their first day of school. You get the backpacks and everyone is happy, especially LL Bean. Not only are they happy they made a sale, but they now have a direct line to you to market their wares. You probably never noticed that when you give a website your email address you start getting ads or a newsletter from those companies. You may unsubscribe at that point, or you may give it a quick look and perhaps purchase from them again.