How is my Ad Credit spent?
This article will explain how your budget is spent on your ad campaign.
Your Ads campaign is paid for on a per click basis (PPC) – the more popular a keyword is, the more expensive the cost per click (CPC) will be. When a user searches for a particular keyword and clicks your ad, you will be charged for it.
Please note that you are only paying for clicks on your Ads, not for the number of times they are displayed on Google search results.
By viewing your campaign’s stats, you can see exactly how many clicks and views your ads have accumulated and what your current CPC value is.