What is pay per click (ppc), pay per lead (ppl) & pay per action (ppa)? Part 2

What is pay per click(ppc), pay per lead (ppl) & pay per action (ppa)?
This video will give you details about how company like google are making millions and billions through online advertising & how can you take advantage of it
PPC – pay per click
PPL – pay per lead
PPA – pay per action (sales)