An upsell step is an extra step added to your check out flow. It should try to get your customers to buy more
When you go to the checkout at Bilka or the gas station, they try to see if they can sell you some batteries, chewing gum or chocolate turtles just before you're about to pay for your goods. It's the "upsell" stage of the offline retail industry. They want to upsell (and don't we all?)
In traditional webshops (i.e. in the 00s), you put an item in the basket and paid. That was it. But in recent years, more and more webshops have started to include an intermediate step when you add an item to the basket. It says "You have added item XXX to your cart. You may be interested in items YYY, ZZZ and QQQ". A bit like the chocolate turtles and batteries.
This extra step is called an "upsell step" and you will often encounter it if you decide to use a recommender engine. They will often recommend that you get an upsell step in your checkout flow.
On Shoporama, you also have the option to activate an upsell step once the customer has added an item to the cart. If your upsell suggestions are relevant or a really good offer, this is a great opportunity to upsell and increase your cart's average order value.
We've been working with online marketing ourselves for decades. As the only shop system in the country, we have spoken multiple times at conferences such as Marketingcamp, SEOday, Shopcamp, Digital Marketing, E-commerce Manager, Ecommerce Day, Web Analytics Wednesday and many more.