DNS is one of the many configurations and options a domain name has. DNS control to which server your domain name is looking at. 
For example, you can configure “yourdomain.com” with the DNS of the Ecolohosting servers (ns1.ecolohosting.com and ns2.ecolohosting.com). Whether you registered the domain with Ecolohosting or another provider, having the DNS pointed to our servers, you can use your hosting at Ecolohosting to publish your website and managing your email accounts.
For a more detailed explanation you can visit Wikipedia: https://en.wikipedia.org/wiki/Domain_Name_System
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