What is a “SDK package sever” in tizen

What is a “SDK package sever” in tizen

BY 11 Mar 2014 Native Application Development

Hi all,
the following link
https://developer.tizen.org/dev-guide/2.2.1/org.tizen.sdk.development/ht…

 will guide us to create a package server & use it.

Can any one please tell me what that Package server actually mean & what is the purpose of the package server.

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