When you have a few domain names with different extensions and you would like all of them to open the same site, you can have the site under one of them and forward the rest. There are different methods to forward one Internet domain name to another, including the so-called domain parking. If your web hosting package deal allows it, though, it shall be better if you host all of the domains and create a URL redirect, not a domain redirect. The main difference between the two is that while a domain name is hosted, you can still have content for it, set up subdomains, email addresses, and many others., 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 domain names, you shall be able to work on them, but meanwhile, visitors will be redirected to the primary site.