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When you have a bunch of stuff in your cart, go through the checkout process, entering your name, email, shipping address etc, but don't actually complete payment. Quit the browser.
Some companies use software that a day later will email you, saying something like "We notice you didn't complete checkout. Was it something we said? Here's a coupon you can use to get 10% off."
So then you check out with the coupon and get 10% (or whatever) off, just for sitting on it a day. (And if you don't get the email, it didn't cost you anything extra to wait a day.)