Working mechanism of straws and siphon

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Homework Statement
What's the difference in the working mechanism between a straw and a siphon? Why do you only need to suck on the siphon once for continuous flow of the liquid whereas if you stop sucking on a straw then liquid stops flowing?
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Is it because for a siphon since the end where the liquid exits is lower than the container level so when the pipe is sucked all the air in the pipe is gone and so liquid moves due to differential pressure, and gravity pulls the liquid down, removing the air in the pipe as the liquid comes down, so this differential pressure is maintained so the liquid just keeps flowing down? Whereas for a straw when you stop sucking on the straw there is no longer a differential pressure to keep the liquid flowing?
 
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