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Thanks for your question. It's an address, like Ethereum address, where you can send cryptokitties to.
We need this to send the winner their cryptokitty.

Great. How can I get this address?

You simply join the Cryptokitties game, and once you've opened up your account, you'll get one.
You will need a browser extention called Metamask in order to "play" the game. You don't really play though it's more of a collectors game.

If interested, simply google Cryptokitties and learn how to get started :)

Cool. I already have Metamask installed on my browser.. I'll google the wallet and sign up for it and start participating... Thanks for the info