What's the difference between the list load processing types?

The difference between each list processing type are as follows:

Non-Householded List Load AS-IS - contains a single name in each record and will load the list without removing any duplicate phone numbers.

Non-Householded List Load DE-DUPE - contains a single name in each record and will remove any duplicate phone numbers. 

Already Householded List Load AS-IS - contains multiple names in each record and will load the list without removing any duplicate phone numbers.

Already Householded List Load DE-DUPE - contains multiple names in each record and will remove any duplicate phone numbers. 

Load Then Household List - will take all matching phone numbers and combine the names associated with each matching phone number in to a single householded record.