If you have several domains with different extensions and you want all of them to open the very same Internet site, you may have the site under one of them and redirect all the rest. There are different ways to forward one domain to another, among them the so-called domain parking. If your website hosting package allows it, though, it shall be better if you host all of the domains and create a URL redirect, not a domain redirect. The difference between the two is that while a domain name is hosted, you can still have content for it, set up subdomains, e-mail addresses, and so on., while with a parked domain you cannot do any of these things. For example, if you're building localized websites under several country-code domains, you shall be able to work on them, but in the meantime, people will be forwarded to the primary website.