Both methods are intended for you to buy more, or spend more money.
I have encountered it many times both online but certainly also with the local merchants.
Both methods are used to get us as consumers to believe we can save a lot of money or get a good which is almost free
Difference Between Cross sell Upsell
Let me start by Cross sell, here are a cross selling example which basically is designed to get you to buy a product that has the features that you are looking for.
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