If you have a number of domain names with different extensions and you want all of them to open precisely the same website, you could have the site under one of them and redirect the rest. There are several ways to redirect one Internet domain name to another, like the so-called domain parking. When your hosting plan allows it, though, it'll 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 address is hosted, you could still have content for it, set up subdomains, email addresses, etc., while with a parked domain you cannot do any of those things. For instance, if you are building localized Internet sites under various country-code domains, you shall be able to work on them, but at the same time, people shall be redirected to the main Internet site.