When it comes to registering domain names you'll generally be given quite a few options in regards to the domain name extensions. This refers to whether you register a .com, .co.uk, .org, .net, etc. TLD - Top Level Domains There are three types of top-level domains that are classified by the Internet Assigned Numbers Authority (IANA) which I've described below. TLD - These are the most common extensions that you're probably familiar with. They are made up of .com, .net & .org domains. ccTLD - These are country code domain name extensions and they are generally made up of 2 characters. Some of the ccTLD extensions that you're probably familiar with are .co.uk for United Kingdom, .ca for Canada, .jp for Japan and .cn for China. gTLD - These are generic TLDs and are generally made up of 3 or more letters. Some of the gTLD domain extensions that you may be familiar with are .biz, .info, .name & .mobi. Domain Extension Meanings .com (Commercial) - Generally intended for commercial use. By far the most recognized domain name extension. .net (Network) - This was originally intended for network oriented sites such as internet service providers. This definitely isn't the case any longer. People will register .net domains for commercial use, generally if the .COM extension isn't available or if they'd like to protect their main .com domain by registering all available extensions. .org (Organization) - This domain extension was originally intended for non-profit or trade organizations. Again, this is no longer the case and is generally registered by anyone looking to protect their main domain by registering all available domain extensions or simply because a better extension isn't available for registration. .biz (Business) - This is a gTLD that is generally registered to classify their website as a business. Although it's not a commonly recognized extension, I feel that it's a great alternative if the .COM extension isn't available. .co.uk (United Kingdom) - This country code domain is generally reserved for commercial related websites based in the United Kingdom. Although it's not restricted to just UK based business, there would be very little value in registering the domain extension unless you plan on doing some sort of business in the UK. .info (Informational) - This gTLD is generally used as an extension for informational websites. I believe that other than .COM, .NET & .ORG, it's the most popular domain extension used. If you are developing an informational website it's definitely a domain extension that I'd register. .mobi (Mobile) - This domain extension, as of this writing, is fairly new. Although majority of the domain name owners registered their domain name with the .MOBI domain name to protect their brand, it is primarily reserved for website built for displaying on mobile devices. .tv (Television) - In my opinion it's used primarily for media, primarily video, related websites. .me (ME) - It was originally the ccTLD of Montenegro but would generally be used for personal related websites such as family websites or blogs another option would be to pose your resume or even artwork that you may have done. .name (NAME) - This is a gTLD that's intended for personal use. You'll find that this extension is used for personal / family websites or simply used for name related email addresses. .ca (Canada) - This is a ccTLD that is generally reserved for Canadian based businesses. .us (United States) - This ccTLD generally refers to US based companies. .cn (China) - This is the ccTLD for China. Plus many more, a lot of them are country code domains that are restricted to businesses or individuals living in that particular country.