If you have several domains with different extensions and you need all of them to open exactly the same site, you can have the site under one of them and redirect the rest. There are different ways to forward one Internet domain name to another, among them the so-called domain parking. When your web hosting package deal allows it, though, it shall be better if you host all the domains and set up a URL redirect, not a domain redirect. The primary difference between the two is that while a domain is hosted, you may still have content for it, set up subdomains, e mail addresses, etc., while with a parked domain you cannot do any of those things. As an illustration, if you are building localized sites under various country-code domain names, you'll be able to work on them, but at the same time, visitors will be redirected to the main Internet site.