When you have a lot of domains with different extensions and you need all of them to open the exact same website, you may have the site under one of them and forward the others. There are different ways to redirect one domain name to another, including the so-called domain parking. If your web hosting package permits it, though, it will be better if you host all of the domains and create a URL redirect, not a domain redirect. The real difference between the two is that while a domain name is hosted, you may still have content for it, set up subdomains, e mail addresses, and so on., while with a parked domain you cannot do any of those things. As an illustration, if you are building localized websites under various country-code Internet domain names, you'll be able to work on them, but meanwhile, people will be redirected to the primary website.