[intrasight]

I've no idea what they mean by "marketplace"

[singlow]

Common term for a site like eBay or Etsy where multiple sellers run stores that share a centralized cart and check-out.

[mbesto]

Consumer buys product X on Website Y and Website Y pays provider Z.

$ flows like this:

X -> Y -> Z

Consumer -> Marketplace -> Provider

Now marketplaces can basically transact from Consumer to Provider instantly. That's huge.

[samtho]

A place where users can sell products or services to other users on the site. This creates a logistical problem where you are collecting payments from users and (potentially) paying out to the same users.

[jonlucc]

Essentially a marketplace accepts funds and disperses some of those funds to another party. One example is Uber: they take payment from the rider and give some of that to the driver.