Better Google position
We can register nearly every possible domain extension, see the complete list and do a domain check on this page. Every domain extension (usually country related) has it´s own set of rules for who can register, or not. Sometimes you have to be a resident of the country, or have a business there.
Having a local domain name in the country you do business in, is important for your local Google ranking. For instance with a .com.br (Brazil) you are not going to enter the USA Google, but in the Brazilian Google you will rank higher than with a normal .com.
Geografic Load Balancing
Domain names and the DNS system can also be used to globally load balance and direct your visitors to local content. USA traffic will be directed to the USA servers and Chinese visitors go to the servers in China. Directing traffic to the closest possible content makes for a faster website experience (4 second rule) and lower latency. On top of that, in case your China servers are down, through the DNS you can route all traffic to the USA, until they are up again.
This way we can guarantee 100% uptime.
Sending your visitors to servers closer to them also gives you a faster website. Ideally your websites loads within 4 seconds and it will load sooner if the content is closer. It works almost the same as a CDN (content delivery network). Biggest difference being that a CDN is only used for images and java scripts.