[ratiolat]

I don't know which kind of answer satisfies you, so I'm gonna answer in many different ways: 1. It's a "frontend" for warehouses 2. It's a webstore for buying stuff 3. It's a middleware between a company buying stuff and warehouse selling stuff

It's usually used by businesses who need to buy gear. It gives you overview of different warehouses selling the same thing, the difference between them is usually delivery time, pricing, amount of stock. So you can decide that hey, I want this from warehouse Y and this from warehouse X. They also do autooptimization based on pricing or amount of shipments if you want to.

The reason why I like them is because it's simple, adfree, easy payment, easy tracking.... it's just easy. For example here's a random product: https://www.markit.eu/us/en/kingston-datatraveler-70-usb-fla... On the left you can see the whole catalogue of things.

The only caveat I'm aware of is that it's for companies only.

But, as said before, I have only used them in Europe where it's the default option and in a rare occasion where they don't offer something, I need to use an alternative. By and large they have 99% of our cases covered. Usually they might not have the cheapest price, but it's okay because the ease of use pays it back in a blink of an eye.