DNS is the address book for your domain
DNS stands for Domain Name System. In plain English, it tells the internet where to send people when they type your domain name and where to send email for that domain. Without DNS, your domain is just a name with no directions attached.
For example, your website may live on one server while your email uses another service. DNS records tell browsers and mail systems where each piece belongs.
The records small business owners hear about most
An A record usually points a domain or subdomain to a server IP address. A CNAME points one name to another name. MX records tell email where to go. TXT records can help prove ownership or protect email delivery with SPF, DKIM, and DMARC.
Nameservers decide where the DNS records are managed. If you change nameservers without copying the right records, your website or email can stop working.
DNS mistakes can look like website or email failures
When DNS is wrong, customers may see the wrong website, no website, SSL warnings, or email delivery problems. The confusing part is that the hosting account or email inbox may be fine. The directions are the problem.
If your site is down after a domain change, start with this article on what to do if your website goes down and then check recent DNS changes.
Plan DNS changes instead of guessing
Before changing DNS, write down what currently handles the website, email, and important subdomains. Take screenshots or export records when possible. Then make only the needed changes and test the website and email afterward.
SMWS can help with domain registration and transfer so DNS, hosting, SSL, and email changes are handled more carefully.