How potential/voltage dividers compare to voltage regulators?

Just realised the datasheet shows a typical set up for setting up a switcher regulator :S

I did have some questions though about why you set it up this way (sorry for going off the original topic slightly). Could someone confirm my understanding of why it's set up this way and answer some questions on it (again sorry for having to ask questions that I assume are basics, but my background is on the software side so I'm pretty much a beginner when it comes to hardware):-

  • Pin 1 is the input voltage. The capcitor that's 100?F, is to help smooth the input voltage
  • Pin 2 is the output. It's connected to an inductor that stores the output charge? The capacitor that follows (1000?F) is to smooth out the output voltage? I'm not sure what the last symbol represents (solid black triangle pointing upwards with a sine wave line over the top)?
  • Pin 3 is ground
  • Pin 4 monitors the current amount 'charged' so it knows whether is should activate or deactivate pin 5
  • Pin 5 controls whether it needs to charge or shut off the voltage depending on the state of whether it has charged 5v

Cheers