When you have a few domains with different extensions and you want all of them to open the same site, you can have the Internet site under one of them and forward all the rest. There are several approaches to forward one Internet domain name to another, among them the so-called domain parking. If your web hosting package deal allows it, though, it will be better if you host all the domains and set up a URL redirect, not a domain redirect. The main difference between the two is that while a domain name is hosted, you may still have content for it, create subdomains, e-mail addresses, and so forth., while with a parked domain it's not possible to do any of those things. For example, if you are building localized sites under several country-code domain names, you will be able to work on them, but in the meantime, people shall be forwarded to the primary website.