Help on how to read and understand google trends

Interest. I'm guessing number of searches/popularity of a term. I doubt anyone knows the exact metric but I could be wrong.
 
Hovering over the graph gives integer values, the largest of which is 100. I think it may be a percentage based metric, with 100 being the highest point in the number of searches.
 
I did some research and found out that the best way to get metrics on search terms were to use Keyword planner in AdWords, and not AdSense. Hope this will be helpful to anyone.
 
Code:
https://support.google.com/trends/answer/4355164?hl=en&rd=1
 
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