| TLD/ccTLD | Intended For | Actual Use |
| COM | Commercial Entities | Used for general purposes and is widely regarded as the standard for TLDs |
| NET | Network infrastructure | ISPs; miscellaneous sites; used sometimes when desired name is not available in .com |
| ORG | Miscellaneous organizations not fitting in other categories (generally noncommercial) | Nonprofits; personal sites; open-source projects; some government websites; mostly used by non-commercial entities |
| INFO | Informational Websites | Used for General Purposes |
| BIZ | For Businesses | Various Uses |
| MOBI | Mobile content providers | Mobile products and services websites |
| CO | Second-level domains (widgets.co) and country-code second-level domain names (ccSLDs) are intended for global use: | Alternative to .com – This domain is also widely used in Colombia. Also, is liked by startups |
| IO | Entities connected with British Indian Ocean Territory | Popular with startup companies and browser games; little if anything related to the territory itself. |
| ME | Entities connected with Montenegro | Positions itself for global use like a personal namespace; can be registered and used for any purpose. Used by businesses in Maine, Middle East, and Montenegro and is popular for domain hacks. |
| AI | Entities connected with Anguilla | Used for some sites based in Anguilla, as well as for websites of companies working in the artificial intelligence (AI) industry; second- and third-level registrations are available worldwide, despite minimal usage. |
| US | Entities connected with the United States | Used in the United States but not as widely as gTLDs U.S. state and local governments (declining in favor of .gov) Some American businesses as alternative to .com Domain hacks (e.g. del.icio.us) |
| TV | Entities connected with Tuvalu. | Marketed commercially for use in television or video-related sites; can be registered and used for any purpose; little use in Tuvalu |
| CC | Entities connected with Cocos Islands | A varied assortment of sites, Such as cricket, cycling, christian church, few of them relating to those islands |
| GG | Entities connected with Guernsey | Popular in Guernsey, gaming, and esports websites |
| PW | Entities connected with Palau | Dedicated namespace to use as a professional identity on the web; can be registered and used for any purpose |
| PRO | Business use by qualified professionals | Internet & information technology professionals, consultants, real estate professionals, financial and accounting professionals, engineers, lawyers, communications professionals, medical professionals |
| WS | Entities connected with Samoa | Not used much inside Samoa, popular for domain hacks |
| IM | Entities connected with the Isle of Man | Personal domain names for instant messaging users, instant messaging websites, trademarks and local Isle of Man businesses |
Used Wikipedia for compiling the above data. I have selected the TLDs and ccTLDs which are generally considered by domain investors and businesses alike. Though there are countless domain extensions but the above domain names have different usages then it was intended for.