When you have several domain names with different extensions and you want all of them to open precisely the same website, you can have the website under one of them and forward the rest. There are a number of methods to forward one domain name to another, such as the so-called domain parking. If your hosting package deal permits it, though, it shall be better if you host all of the domains and set up a URL redirect, not a domain redirect. The real difference between the two is that while a domain is hosted, you may still have content for it, set up subdomains, e mail addresses, and many others., while with a parked domain you cannot do any of those things. As an example, if you are building localized websites under several country-code domains, you will be able to work on them, but in the meantime, visitors will be forwarded to the main site.