If you have a lot of domains with different extensions and you want all of them to open exactly the same Internet site, you can have the website under one of them and redirect all the rest. There are a number of ways to redirect one domain to another, including the so-called domain parking. If your hosting plan permits it, though, it will be better if you host all 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 may still have content for it, create subdomains, email addresses, and so on., while with a parked domain it's not possible to do any of those things. For example, if you are building localized websites under different country-code domain names, you shall be able to work on them, but meanwhile, visitors shall be redirected to the main site.