Pls tell me the difference about "Search Online for Urls" and "Search Online for site lists"

Hello,Every GSA Ace,Pls tell me the difference about "Search Online for Urls" and "Search Online for site lists"!They are all used by footprints!

If you click on "Add predefined Footprints" you will see it adds the footprints differently for each function. The site list search uses e.g. pastebin.com to search for pastes that show URLs in it.