what is cdn prefix instead of www in web address

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In place of a missing www prefix I sometimes see cdn.

Is this for a special service or program, different from a webserver ? Is there a list of all common leftmost subdomains/domain prefixes?

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cdn stands for content delivery network mainly used for application services (such as cloud based services from Google or Microsoft). I don't know of any list out there for all of the prefixes, but there may be one that I haven't ran across yet.