12.1.1 Automatic Phone Home vs Automatic Update Check

Hello, I am looking for clarification of Automatic Phone Home vs Automatic Update Check under:

System ›› Software Management : Update Check

What does Automatic Phone Home do? What information is sent?

What does Automatic Update Check do? What information is sent?

K15000: "Using the Automatic Update Check feature" does not clarify the differences between the two.

Thanks