Here's how it works: to remember, say, a shopping list, imagine walking to the store.

下面是它的机理：记住或说出一个购物表，想象自己在去一家商店里的路上。

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Often, users are issued a session IDs that can be used later to recall a particular application state (think about shopping a cart application that has to remember what's in the cart).

通常，签发给用户一个会话id，以后，用户就能够使用这个ID恢复特定应用程序的状态(考虑购物的情形，购物车应用程序需要记住车内都有哪些物品)。

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And the next time you go shopping, remember this fashion stylist tips and pick a nice belt or two to glam up your favorite outfits.

下次逛街的时候，记得买上一两条既时尚有好看的腰带，能为你的穿着打分不少哦！

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With couponing, if the user clips, emails or saves a coupon to their shopper card, the item is automatically added to their shopping list so they will remember the offer and actually purchase the product.

FORBES: Advertising Week 2010: Kraft on Consumer Engagement

Compare that with a television ad, which has to create such an impression that you remember it days later when you are shopping.

ECONOMIST: Electronic commerce