What Is DNS, and Why Does It Matter When You Change Your Website?

Every website has two addresses. One is the name people type, such as yourbusiness.com. The other is a string of numbers that tells the internet where your site is actually stored. DNS is the system that connects the two. Most owners never think about it, until a change goes wrong and the website or the email stops working.

What DNS does, in plain words

Think of DNS as the phone book of the internet. When someone types your domain name, DNS looks up where your website lives and sends the visitor there. It also tells the world where to deliver your email.

These instructions are stored as DNS records. A typical business has a handful: one that points your domain to your website, one that directs your email, and a few others that confirm you own the domain or connect outside services.

You do not need to understand every record. What matters is knowing that DNS sits behind both your website and your email, so any change to it deserves care.

Why it matters when you change your website

DNS only comes into play when something changes. Launching a new site, moving to a different host, or switching email providers usually means updating these records. A wrong or missing record can cause:

• Your website showing an error, or an old version of the site
• Email bouncing or never arriving
• A security warning in the visitor's browser
• Some parts of your site loading from the wrong place

The most common mistake is deleting a record because it looks unfamiliar. The record that seems unimportant is often the one keeping your inbox working.

Why changes are not instant

After a record is updated, it can take anywhere from a few minutes to a day or two for the change to reach everyone. Different internet providers refresh their information at different times, so for a while some visitors see the new site while others still see the old one.

That is normal, and it is the reason to keep the old site running until the switch has fully settled. Our guide to moving your website to a new host walks through the whole process.

Simple habits that prevent trouble

• Take a screenshot or write down your current records before changing anything
• Change one thing at a time, and check that everything still works afterward
• Keep your domain registered in your own account. See the difference between a domain, hosting and a website
• Make sure your domain never lapses. See what happens when your domain expires
• Ask whoever manages your website before touching these settings

If you are not sure what a record does, leave it alone and ask. DNS mistakes are easy to make, and they are usually just as easy to fix once the right person is looking at them.