The .com is intended for commercial use and is a generic top-level domain (gTLD). It was one of the original top-level domains, established in January 1985, and has grown to be the largest TLD in use. It is often pronounced as a word, dot-com.
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.com - commercial/general
The .com domain name extension is used globally for all purposes, from personal to corporate.
Dot com domain names are incredibly good value at the moment with companies and individuals only just beginning to realise the enormous potential in generic .com domain names.
.com names are the world's most popular domain extension. Originally used by companies based in the US or companies with a multi-national presence, but now widely used by individuals and organisations around the world.
Added advantage of being the "default" domain name in most web browsers i.e. if someone types in just yourcompany in their web browser it will automatically look first for yourcompany.com.
There are no special requirements in order to use a .com as your domain name extension.