When you have a number of domains with different extensions and you want all of them to open exactly the same site, you can have the Internet site under one of them and redirect all the rest. There are several approaches to forward one domain to another, among them the so-called domain parking. When your website hosting plan permits 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 name is hosted, you could still have content for it, create subdomains, email addresses, etc., while with a parked domain you are unable to do any of those things. As an illustration, if you're building localized Internet sites under various country-code domains, you shall be able to work on them, but meanwhile, people will be forwarded to the primary Internet site.