Difference between Fulfilled and Shipped orders?

[geckoboard]

In the new order reporting, there are metrics called "Fulfilled orders" and "Shipped orders".

In the help documentation these are defined as:

Fulfilled orders = The number of orders fulfilled during the selected time period.

Shipped orders = The number of orders that were shipped during the selected time period.

However, the API doesn't differentiate between fulfilled and shipped. Based on the documentation here (https://shopify.dev/api/admin/rest/reference/orders/order), orders with fulfillment_status=fulfilled are also shipped.

"shipped: Show orders that have been shipped. Returns orders with fulfillment_status of fulfilled."

Can you clarify what is the difference between these metrics in the report?