Why do we use terminal server since we can reach each device without terminal server ?

Hi Expert,  Can you explain Cisco function of terminal sever and why we need terminal sever since we already can reach and manage each Cisco devices? Thank you
eemoonAsked:
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arnoldCommented:
Usually, that means a misconfiguration.
Usually, the devices should be restricted through ACls by limiting how and from where connections to manage each device can orginate.
RafaelCommented:
A terminal or comm server commonly provides out-of-band access to multiple devices via the console port  as opposed to the normal  SSH or Telnet ports.

A good example usage is when making ACL changes to keep yourself from getting  locked out.

HTH
-Rafael

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eemoonAuthor Commented:
Thank you for your reply. I am also sorry that i did not say it clearly.
My question is that since we are able to reach each Cisco device by management interface or some vlan interface, why we still mention/use terminal sever to reach these devices ? 
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