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Intranet 
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Extranet 
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1)Intranet is an internal network. It is used by companies to connect
  their computers on a network.  
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1)Extranet, on the other hand, is an internal network that can be
  accessed externally. The extranet can be thought as an extension of the
  company’s intranet 
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2)Only insiders are available to access 
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2)Outsiders can access if they have the username and password 
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3)Only internal computers are linked in intranet 
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3)Outsiders can gain information through linked computers externally 
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