DNS stands for Domain Name System. When you enter a web address in your browser, the browser's first step is to find out which IP address at the relevant domain hears. For this, you contact a so-called Recursive Name Server (DNS server). This is often a server from your access provider, the party that provides your internet connection, for example Ziggo, Kpn, or xs4all. But it can also be a publicly accessible server from, for example, Google.
When a website moves to another server and consequently gets a new IP address, this leads to an update in the domain's DNS records. The party where you registered your domain forwards this change to the relevant root server. From there, it is passed on to all Recursive Name Servers. Due to this system, it can take several hours for a change to be implemented for everyone.
DNS therefore ensures that servers worldwide are accessible using an easy-to-remember and communicate name instead of a numeric IP address!
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