For each product you create in Magento, you have the opportunity to attract additional purchases from customers by linking products together. These crosslinks allow you to encourage shoppers to consider buying more products than the one they're reviewing. In the bricks-and-mortar world we're constantly bombarded with similar promotions. For instance, if you go into the grocery store, you'll often find small, red coupon machines hanging off the shelves, encouraging you by their flashing red light to pull a coupon out while you're reaching for the canned peaches you came for. Throughout the store, placards and banners promote "2-for-1" specials or "buy 1, get 1 free." The area around the checkout lane is crowded with magazines, razor blades, batteries and gum, put there to catch your eye just as you're about to leave the store.

In a similar fashion, Magento allows you, the store administrator, to encourage shoppers to spend more during their online...