If you have several domain names with different extensions and you want all of them to open the same site, you could have the site under one of them and redirect the others. There are different ways to forward one Internet domain name to another, including the so-called domain parking. If your hosting plan permits it, though, it shall be better if you host each of 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, set up subdomains, e mail addresses, and so forth., while with a parked domain you cannot do any of those things. For instance, if you are building localized websites under various country-code domain names, you will be able to work on them, but at the same time, visitors will be redirected to the primary site.