You are able view the forms library and complete forms in an offline mode so you are able to continue working while unable to access the internet.
When you submitted a form while offline the form is placed in a pending queue. The pending queue will automatically submit once an internet connection becomes available.
You will get a notification when you're offline showing that the forms are being stored on the device.
You're able to view your pending queue. This will display the list of pending forms, the date and time they were submitted, and a delete option.