In case you have several domain names with different extensions and you need all of them to open the same site, you can have the website under one of them and redirect the others. There are a number of ways to forward one Internet domain name to another, like the so-called domain parking. When your hosting plan permits it, though, it'll 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 address is hosted, you can still have content for it, create subdomains, email addresses, etc., while with a parked domain you can't do any of these things. For instance, if you are building localized websites under various country-code domain names, you shall be able to work on them, but meanwhile, people will be forwarded to the main Internet site.