An order in Ubercart is created when the user validates the checkout form, that is, submits the form at /cart/checkout.
An order has a unique ID, a list of products, the details of the user who is making the purchase, and [add here].
sections needed here:
[Describe the possible status an order can have, what they mean, what causes them to change]
[for devs, link to: http://www.ubercart.org/docs/api/uc_order_status_list]
What admins can usefully do to an order.