whatis difference between Adsense and CPA keywords

Hi, im learning keyword research, here i get one doubt.

What is difference between cpa keywords and Adsense keywords?

I have few more questions. They are following

1. What is clickbank keywords? Kindly tell how they differ from amazon buyer keywords?

Kindly tell the answer with example

Thank you all

They're all different affiliate platforms.

Very basically;

Adsense is clickable links on ads.

Clickbank and Amazon are buying goods through affiliate links.

CPA is someone doing a survey or email submit to get access to a product or enter a draw.

It's pointless trying to target 'best drone 2017' as a keyword if you are doing cpa.