nameserver zone files

I noticed that a tech added zone files today for 2 of my nameservers on the server,

ns1.mywebsite.com and ns2.mywebsite.com

2 file sin /var/named:

ns1.mywebsite.com.db and ns2.mywebsite.com.db

I also noticed the 2 nameserver entries in /etc/named.conf

Those zone files were never created for those nameservers but yet I could access the websites fine. What's the benefit of adding them? Will it make the nameserver faster/slower and would more people be able to access the domains on the server without problems? Thanks in advance.

 

 

 

 

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