What does it mean by floating

What is a Floating week?

The purchaser of a floating timeshare week has the flexibility of scheduling their vacation interval with yearly variations in accordance with the resort's guidelines. Typically, resorts will accept requests for specific weeks by the interval owner as soon as the annual maintenance fees are paid. Therefore, the earlier the maintenance fees are paid the better the chance that the owner can pick a specific interval week.

What does a week during interval #2 mean?