Although .com domains have always been intended for commercial use, they are currently available for anyone to register. In the 1990s, .com became the most common top-level domain for websites, especially commercial ones, and gave its name to dot-com companies. The introduction of .biz, which is restricted to businesses, has had little impact on the popularity of .com.
Although companies anywhere in the world can register .com domains, many countries have a second-level domain with a similar purpose under their own ccTLD. Such second-level domains are usually of the form .com.xx or .co.xx, where xx is the ccTLD. Australia (.com.au), the United Kingdom (.co.uk), Mexico (.com.mx), New Zealand (.co.nz), People's Republic of China (.com.cn), Japan (.co.jp) and South Korea (.co.kr) are all examples.
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