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Help me understand MASQ, DNAT, and SNAT

Hello.  I'm having a tough time understanding the primary differences between these three in certain contexts.

For example, I create a rule to allow certain incoming traffic to be forwarded to an internal machine.

If I do...say:

Name: Service
Match Parameters: Any --> External_IF / Service
SRC translation: External_IF 
DST translation: Internal_Computer1

The packets won't pass.  But if I select MASQ_External_IF for the SRC translation, everything immediately starts working as it should.

Why is this?

And I really don't understand SNAT at all. 


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