When you visit a website like kgm.dk or google.com, you are using a domain name. But what exactly is a domain name, why do they exist, and how do they work behind the scenes? In this article, you’ll get an easy-to-understand introduction to domain names, their role on the internet, and how you can get a domain yourself.
A domain name is a unique address on the internet that makes it easy for people to find websites. Instead of remembering long strings of numbers (IP addresses), we can use simple names like eksempel.dk or wikipedia.org. Domain names act as signs that guide us to the right place online.
Each domain name is unique – two websites cannot have the same domain.
The internet consists of millions of computers communicating via IP addresses, which look like this: 192.0.2.1 or 2001:db8::1. For us humans, it’s hard to remember these numbers. Domain names make it easy to navigate the web because we can use words instead of numbers.
When you type a domain name into your browser, several things happen behind the scenes:
You can compare DNS to the internet’s "phone book," where domain names look up who they should connect to.
Domain names consist of several parts, separated by dots. Let’s take www.eksempel.dk as an example:
The most well-known top-level domains are:
If you want your own website, you need to register a domain name. You do this with a domain registrar, which is a company authorized to issue domains.
Domain names can be transferred or sold if the owner wishes.
A domain name can be extended with subdomains (sub-level domains), which act as separate addresses under the main domain. For example:
Companies often use subdomains to separate different departments or functions on their website.
Domain names can be misused for fraud (e.g., fake websites, phishing), so it’s important to check that you are entering the correct domain. Many browsers now mark unsafe or suspicious domains.
Additionally, HTTPS (the padlock symbol in the browser) shows that the connection to the domain is encrypted and secure, but it does not say anything about who owns the domain.
New top-level domains are constantly being introduced, such as .app, .shop and .online. This gives more opportunities to find a good domain, even though the popular ones are often already taken.
At the same time, work is being done to make domain names even more secure, including better validation and protection against misuse.
Domain names are the addresses of the internet and make it possible for us to find and use websites without having to remember complex numbers. They are a central part of how the internet works and important for both users and businesses. Next time you visit a website, you’ll know exactly what a domain name is – and why it’s important!
