The Domain Name System (DNS) is the internet’s address book. It turns a name people can remember, like topdevs.nl, into the numeric IP address that computers actually use to locate a website. Without it you would have to type a string of numbers for every site you visit.
Think of it like the contacts app on your phone. You tap a friend’s name, and behind the scenes the phone dials the real number. You never see or memorise the digits. DNS does the same job for every website, mail server, and online service, quietly looking up the right address each time you type a domain. And it happens in a fraction of a second. By the time the page starts loading, the lookup is already done.
The system is spread across thousands of servers around the world, which is why it almost never goes down all at once. When your browser asks for topdevs.nl, the question hops from one server to the next until it reaches the one that knows the answer. The result then gets cached for a while, so the next visitor gets the address even faster.
This lookup relies on DNS records, small entries that say which server answers for a name. When you launch a new site or move to a new host, these records get updated, and the change ripples out across the internet over a few hours. That spread is why a fresh website sometimes loads for one person but not another for a short while.
At TopDevs we handle the DNS setup when launching a client site, so the domain points to the right place from the moment it goes live.
