If you have a number of domains with different extensions and you want all of them to open the same site, you could have the Internet site under one of them and forward the rest. There are several methods to forward one domain name to another, such as the so-called domain parking. If your hosting package permits it, though, it will be better if you host all the domains and set up a URL redirect, not a domain redirect. The real difference between the two is that while a domain is hosted, you could still have content for it, set up subdomains, email addresses, and many others., while with a parked domain you can't do any of these things. As an illustration, if you are building localized sites under different country-code domain names, you shall be able to work on them, but at the same time, people will be redirected to the main Internet site.