What are the differences between the Caching and the Software Update Services

New to working with OS X Server and am confused about the differences between the Caching Service and the Software Update Service...it seems to me that they overlap in that i) the Caching Service updates OS X software, iOS software and any apps purchased from the app store while ii) the Software Update service updates OS X software.
If the above is correct they why would one run both Services?  I would think that one would run the Caching Service and call it a day!
And while on the subject, what about caching and pushing third party apps like MS Office?

Linc Davis wrote:
The simple answer is that you almost certainly don't need the Software Update service. Just use the Caching service. Neither one works with content that doesn't come from Apple.
Appreciate the response but could you please explain the difference between the two as that is the one item that remains unanswered.
Thanks,
Joel

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