The extension of your website is usually chosen according to the type of websites that you have. There are different extensions to satisfy different purposes. For an instance, if your website is catering to a local audience then the domain name will require a country specific extension. This way your target audience can easily reach your website and avail its products or services. The most common extensions are dot com, dot net and dot org and work well for the international audience throughout the globe. Then there are specific extensions like dot edu meant for the educational institutions.