Upselling is essentially the sales technique where sellers influence customers to purchase more expensive items or upgrades or add-ons, in hopes of making a more profitable sale. It usually requires marketing more profitable services by exposing the customer base to more options that they may not have considered yet.
Cross-selling, on the other hand, is when sellers sell an additional service or product to an existing customer. The objective of this practice is to either increase the income from the client or to protect the relationship. With this in mind, it’s important to ensure that the additional product or service that you’re selling is supposed to improve the client somehow.