It's for free. You don't need to pay for domain name.
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Your URL will be something like
http://top9.atspace.com . As I noticed above, the advantage is that you don't need to pay for domain. But note that if you move your website to another provider in the future you can loose some or all your traffic.
Your provider will probably include ads to your pages - usually 1 or 2 banners, sometimes popup windows. If you plan to use banner exchange on your site read carefully their Terms and conditions. Some free hosts doesn't allow it.
Free hosts usually allow lower bandwith then paid hosts and a lot of them don't offer futures like PHP and MySQL.
A lot of free hosts change their Terms and conditions during some time. If your free host offers hosting without ads now, don't be surprised when banner or popup appears on your site in the future.
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