Multiple entry points – You can have specialized domain names for a parent site, where all the non-parent sites will redirect to lead to the parent domain. That will not only give you a whole group of eager audience but will also improve your page rankings in search engines.Protection - If you own a successful business, it's a great idea to think of some of the variants of your site name and purchase those as well and put a 301 redirect on those

Typos – Domain names can be misspelled and therefore you need to keep them as well. E.g.: Both gooogle.com and google.com point to same domain.Regional content - If your site has regional content, you might purchase specific domain names to focus on that content. For e.g.: you can have mydomain.us and mydomain.au so with different local content for each site.