DNS services allow you to use a nice little interface to set DNS records. Some registrars (like GoDaddy) have a built-in management system that lets you specify

DNS services allow you to use a nice little interface to set DNS records. Some registrars (like GoDaddy) have a built-in management system that lets you specify A and CNAME records within your web browser. Short of this, however, a lot of people would rather use a service that implements similar functionality than have to manage a BIND server themselves. Other than possible dynamic DNS issues (not really a problem for professionally hosted web sites), there aren't really any features that DNS services offer; it's a pretty simple concept in general, after all (host name request yields corresponding IP).