What is the special financing from Apple?

I wanna buy an Iphone 5s but i don't understand how it works or how can that help me. Please explain with easy words

You sign up for a Barclaycard credit card account.

You purchase an iPhone within 30 days of opening the account.

If you make payments monthly on time and pay off the full amount within 24 months you will not be charged interest.

If you do not pay off the full amount or make a late monthly payment you will be charged interest on the full amount. Interest is charged at 22.99% from the day you buy the iPhone.

http://store.apple.com/..._credit_24

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