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Enough information to confirm answer.
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I have local domain &nbsp;abc.com &nbsp;and external website www.abc.com&nbsp;<br />
i have added a host record to the DNS pointing to the external website IP address <br />
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but still internal users try to access abc.com via a web browser it will result in 'Page cannot be displayed'
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I have local domain  abc.com  and external website www.abc.com 
i have added a host record to the DNS pointing to the external website IP address 

but still internal users try to access abc.com via a web browser it will result in 'Page cannot be displayed'

error 'Page cannot be displayed' when internal users try to access external website

The Domain Name System (DNS) is a hierarchical, globally distributed system responsible for associating the name of a computer, service or other resource into an IP address for connecting to the Internet or a private network. Most prominently, it translates domain names to the numerical IP addresses needed for the purpose of computer services and devices worldwide.

A domain controller is a server that responds to security authentication requests within a computer network domain. It is a network server that is responsible for allowing host access to domain resources. It authenticates users, stores user account information and enforces security policy for a domain