Why internet is said to be untrusted network?

Posted by Ant's on Super User See other posts from Super User or by Ant's
Published on 2012-07-11T08:10:22Z Indexed on 2012/07/11 9:17 UTC
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From wikipedia : 2

In computer security, a DMZ (sometimes referred to as a perimeter networking) is a physical or logical subnetwork that contains and exposes an organization's external services to a larger untrusted network, usually the Internet.

Why it says

larger untrusted network, usually the Internet.

I see it many places that internet is said to be untrusted network. Are there any reason for it?

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