Do you know that any user can take your adsense code and can add it
on any type of website including illegal websites? This can be done
intentionally too, to block your Google adsense account. That is why, Google Adsense have a feature called Google Adsense Allowed Sites by which you can tell Google to display your adsense advertisements only on those sites were you want to display.
Suppose you have enabled this feature & if someone is intentionally placing your Google adsense codes on illegal websites then in that case, the impression and clicks from those websites will not be added into your adsense earning chart. So, once you have enabled Allowed sites feature then you have added one more level of security to secure your approved adsense account.

As shown in the above screenshot, if you want to show Google adsense ads only on your website then select the second radio box and enter your website address and click on save changes button. Now you can sit back and relax a bit.
Suppose you have enabled this feature & if someone is intentionally placing your Google adsense codes on illegal websites then in that case, the impression and clicks from those websites will not be added into your adsense earning chart. So, once you have enabled Allowed sites feature then you have added one more level of security to secure your approved adsense account.
Steps to Enable Allowed sites feature in Adsense
First of all, login to your Google Adsense Account and navigate to Adsense setup Tab and then click on Allowed sites tab.
As shown in the above screenshot, if you want to show Google adsense ads only on your website then select the second radio box and enter your website address and click on save changes button. Now you can sit back and relax a bit.