Magento and its upgrades.

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Upselling (sometimes 'up-selling') is a sales technique whereby a saleperson induces the customer to purchase more expensive items, upgrades, or other add-ons in an attempt to make a more profitable sale. Upselling usually involves marketing more profitable services or products, but upselling can also be simply exposing the customer to other options he or she may not have considered previously. Upselling implies selling something that is more profitable or otherwise preferable for the seller instead of, or in addition to, the original sale. A different technique is cross-selling in which a seller tries to sell something else.

In practice, large businesses usually combine up-selling and cross-selling techniques to enhance the value that the client or clients get from the organization in addition to maximizing the profit that the business gets from the client.