Initially, there were a few essential different domain name extensions that one could choose from. All domains are registered under a topmost part of domain name, a domain name extension such as .com or .co.in
On the global front, the choices available were .com for commercial organizations, .net for network services such as ISPs and .org for non - governmental and non-profit organizations.
Alternatively, various countries provided the optional domains based on the two - character ISO country codes, like ".ca" for Canada, ".uk" for United Kingdom and so on.
Later on domain extensions such as .tv for internet Television services providers, .biz for business and .info for website giving specific information also came in to existence. These are all alternative domains which have either restricted access attached to it or less popularity on the web.
But one has to be aware while choosing and buying a “alternative” domain as it is possible that no one may be able to visit and get trapped resulting in to zero mileage received in spite of having a website.