When you have several domain names with different extensions and you need all of them to open exactly the same website, you could have the website under one of them and forward the rest. There are various methods to forward one Internet domain name to another, including the so-called domain parking. If your hosting package deal allows it, though, it shall be better if you host all of the domains and set up a URL redirect, not a domain redirect. The primary difference between the two is that while a domain name is hosted, you could 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 these things. For instance, if you are building localized sites under different country-code domains, you will be able to work on them, but in the meantime, visitors will be redirected to the main website.