The Domain Name System (most commonly referred to by it's abbreviation DNS) is the system used by the interet to translate your domain name from it's commonly used URL (ie. www.example.com) into its true numerical IP address (ns1.example.com 12.34.56.78). Those addresses are also commonly referred to as nameservers.

When you register your domain name, you must give your registrar specific DNS information, so that your www.example.com can be redirected to where your site actually resides.

You can also park your domain name where your registrar will automatically insert their own DNS information for their domain parking.

Even if you have your site set up on a hosting company, if you do not point your domain name's DNS to the correct address, your site will not be accessible when potential visitors enter in www.yourname.com.

It can take up to 48 hours for your DNS to propogate across the internet. This means that if you have just changed your DNS information then go to http://www.yourname.com, you will still be seeing your site on your old hosting company's server.

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