When you have a few domain names with different extensions and you want all of them to open exactly the same Internet site, you can have the site under one of them and forward all the rest. There are several ways to redirect one domain to another, including the so-called domain parking. When your hosting package allows it, though, it shall be better if you host all the domains and set up a URL redirect, not a domain redirect. The difference between the two is that while a domain is hosted, you can still have content for it, set up subdomains, e mail addresses, and so on., while with a parked domain it's not possible to do any of those things. For instance, if you are building localized sites under several country-code domain names, you shall be able to work on them, but meanwhile, visitors will be forwarded to the primary site.