A domain is a .com, .net, .edu, .tv, etc.. address. Geocities just gives you web space they do not offer you the ability to get poeme-is-cool.com for instance which is a domain name. Domain names are purchased from companies called registrars where you normally pay a yearly fee to own the name. Lots of hosting companies will make it easier for you by purchasing a domain name for you as part of your hosting fees. You will not get one at a free service though. With geocites your website ends up being hosted at http://www.geocities.com/somethinghere.