DNS is made up of many different elements that control different aspects of your domain name. Here's a quick explanation of each one:
Nameservers "point" your domain name to the company that controls its DNS settings. Usually, this will be the company where you registered the domain name. However, if your website is hosted by another company, sometimes they will provide nameservers you need to point to instead.
Zone Files are simply the files that store all of your domain's DNS settings. Your domain name's Zone File is stored on the company's nameserver.
A Records point your domain name to an individual server using an IP address. An example IP address is 220.127.116.11. Every domain name has a primary A Record called "@" which controls what your domain name does when some visits it directly. You can also use A Records to point subdomains (for example subdomain.coolexample.com) to a server's IP address.
CNAMEs point your subdomains to another server using a server name, like server1.tmhnetwork.com. Most domain names have many CNAMEs. Unlike A Records, CNAMEs cannot use IP addresses.
MX Records point your domain name's email to its email provider.
If your domain uses our nameservers, you can view or change your domain's DNS through cPanel >> Domains >> Advanced DNS Zone Editor.