With the Disney's FASTPASS, you will spend less time waiting in line and more time enjoying the parks.
How it Works
Just slide your Disney ticket through the FASTPASS Machine at the participating attraction. Your Disney FASTPASS ticket will be imprinted with a designated ride time. Now you are free to go and enjoy the rest of the park. When you ride time rolls around, come back to the FASTPASS entrance and hop on the ride with no further wait.
Currently this is service is FREE, Disney may change that in the future! 
Take advantage of Disney's FASTPASS® service. You can enjoy the rest of the park while FASTPASS® saves your place in line.
To use Disney's FASTPASS® service:
Look for the FASTPASS® distribution area near the entrance of an attraction
Check the FASTPASS® “Return Time” display which gives you a span of time during which you can explore the Park before returning to board the attraction.
If the Return Time is sufficient for your plans, just insert your Walt Disney World® Resort admission ticket, readmission ticket or Annual Passport into the machine.
A FASTPASS® ticket will emerge with your Return Time printed on it. Now you're free to go and enjoy the rest of the Park.
Go back to the FASTPASS® Return queue when your return time rolls around, show your FASTPASS® ticket to Cast Member at the entrance, and enjoy the attraction with a minimal wait.