When you have a few domains with different extensions and you want all of them to open the same Internet site, you could have the site under one of them and forward all the rest. There are several ways to redirect one domain to another, among them the so-called domain parking. When your website 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 is hosted, you could still have content for it, create subdomains, e-mail addresses, and so forth., while with a parked domain you can't do any of those things. As an illustration, if you're building localized sites under various country-code domains, you will be able to work on them, but meanwhile, people shall be redirected to the main Internet site.