if someone click a few times on my adwords how they charged me?

does google charged me for 1 click or according to the clicks?

and i want to know if there is auto clicker to click on ad words because i find something strange on my campaign i think someone clicks my ad alot of times
thanks

 

I would think that it would only charge you once. I'd like to know what it actually is though

 

Adwords has reports that show you invalid clicks (click fraud) in which their system automatically filtered out, but do check your log files for clicks from identical IP address. Identical IP address is just one of the ways you can spot click fraud.