No you don't have to have a magic band to do fast pass for rides or to enter a theme park. But what they are good for is if your staying at a Disney resort you can use it to enter the parks, unlock your Disney Resort hotel room and buy food and merchandise. ... MagicBands add a touch of magic to your vacation by unlocking special surprises, personalized just for you, throughout the Walt Disney World Resort. Once you've linked your MagicBand, you don't need to do anything different.
Not everyone will habe a magic band but is fast the most convenient way to access the parks, use fastpasses, purchase items and use food packages. Also tapping to save photos and if staying in disney hotel use to open doors.
It's a digital pass on your wrist that allows you onto rides /attractions
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