When you have a few domain names with different extensions and you need all of them to open precisely the same website, you can have the Internet site under one of them and redirect the rest. There are various methods to redirect one domain to another, such as the so-called domain parking. If your website hosting package allows it, though, it shall be better if you host all the domains and create a URL redirect, not a domain redirect. The difference between the two is that while a domain is hosted, you may still have content for it, create subdomains, e mail addresses, and so on., while with a parked domain you can't do any of those things. For instance, if you're building localized Internet sites under several country-code domains, you will be able to work on them, but in the meantime, visitors shall be forwarded to the main website.