difference between output of "yum ps" and "needs-restarting"?

[Georg Wittig <nc-wittigge@xxxxxxxxxxxxx>]

Hi,

can anyone please explain the difference between the output of
     yum ps                (from the RPM yum-plugin-ps)
and
     needs-restarting      (from the RPM yum-utils)

I couldn't find many infos about those 2 commands.
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