What's the difference between noise cancelling and noise isolation headphones?

I'm going on a flight in a few weeks, and want some good [though low budget!] headphones. I'm wondering what's the difference between noise cancelling and noise isolation headphones? Would noise isolation headphones be just as good at disguising aircraft engine noise?What's the difference between noise cancelling and noise isolation headphones?
Noise canceling headphones have a circuit that listens to the outside noise and sends an opposite sound to the headphones to cancel the noise. Sound isolation headphones are more simple. They cover your ears and have insulation inside the headphones to muffle the outside sounds.





What I do on airplanes is just get some cheap foam earplugs and read a book or magazine.

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