The Disney hopper tickets allow
you to visit more than one Theme Park on the same day, and also allows
you to upgrade any unused days as valid for life.
Visiting all four major parks on
one day only constitutes one day of use, and the longer passes offer
even more flexible, allowing you to visit any of the minor parks in one
day as well.
If you buy the hopper tickets
from Disney, then you do not need to use the ticket on consecutive
daysyou can use it within the numbered amount of days from the first
use, or you can upgrade it, as described above.
When looking for tickets online,
you should be careful only to buy from Disneyworld.Other sources are
unreliable, and you cannot be sure that you are buying real passes.