Using the name servers at the registrar?

What is the difference between using the DNS at my registrar, and using the DNS of the company that is hosting my server?

Let me explain: my registrar is register.com and, if I use their name servers, they allow me to add CNAME, A and MX records for my sites.

On the other hand, if I point the register.com name servers to the DNS servers provided by my hosting company, then I can change those same DNS records through a user interface that my hosting company provides.

As I see it, these are two ways to do the same thing. So I ask what am I missing? Why would I want to use my hosting company's DNS servers instead of those of register.com? Or vice versa?

 

 

 

 

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