DNS stands for Domain Name System, which is a system that translates human-readable website addresses (domain names) into IP addresses, which are used by computers to route traffic on the Internet.
For example, when you type in www.google.com into your browser, it will look up this domain name in its DNS database and send your request to Google's servers.
DNS servers are located all over the world and are maintained by different organizations such as enterprise networks, ISP, and other groups of public or private persons.
Your computer has a "hostname" that's easy to remember, such as "google.com," but your computer can't communicate with other computers using only this name.
It also needs an IP address, which is a series of numbers separated by periods. Computers use IP addresses to route traffic between them.
DNS translates hostnames, which are easy for people to remember, into IP addresses, which computers use to communicate over the Internet.
It also translates subdomains into IP addresses for their respective domain names (e.g., "www" in the URL "www.google.com").
If you don’t monitor DNS records, then you’re not monitoring the health and security of your website. DNS is one of the most common targets for attackers because it’s so easy to compromise.
You can use a free tool like MonSpark to keep an eye on your DNS records, so you'll always know when they've been changed.