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