Actuators in cloud / fog


I'm trying to do a research on actuators in cloud/fog for my university, but every study/research that i read just mention that actuators exist and they don't explain how they work and what they exactly do.

I get it, that they are able to change their environment by initiating different events. But how do they decide what kind of even should be fired? Where do they get their data from?
What kind of features do they have (like latency, delay, storage capacity etc) ?
Is this a valid scenario?: A device sends data to a fog node or cloud -> after the data is processed something is sent back to the actuator -> the actuator decides what should happen with the station
Any help , tip or reference to studies would be helpful.

submitted by /u/thedaxan
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