If you have a number of domains with different extensions and you want all of them to open exactly the same Internet site, you could have the website under one of them and redirect the rest. There are several approaches to forward one domain name to another, like the so-called domain parking. When your website hosting package deal allows it, though, it shall be better if you host each of the domains and create a URL redirect, not a domain redirect. The main difference between the two is that while a domain is hosted, you may still have content for it, set up subdomains, email addresses, and so on., while with a parked domain it's not possible to do any of these things. For instance, if you are building localized websites under several country-code domains, you shall be able to work on them, but at the same time, visitors shall be forwarded to the main site.