In case you have a lot of domains with different extensions and you would like all of them to open exactly the same site, you can have the website under one of them and redirect all the rest. There are various methods to forward one domain to another, such as the so-called domain parking. When your website hosting plan permits it, though, it shall be better if you host all the domains and create a URL redirect, not a domain redirect. The primary difference between the two is that while a domain address is hosted, you can still have content for it, create subdomains, e-mail addresses, and many others., while with a parked domain you cannot do any of these things. For example, if you are building localized sites under different country-code Internet domain names, you'll be able to work on them, but meanwhile, people shall be redirected to the primary site.