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Hi mominfaisal!

The official WordPress.com advertising program is called WordAds. Advertisements from third-party ad networks like Google AdSense are not allowed on WordPress.com however if you are still interested you can try a self-hosted WordPress installation. More information on this can be found at the following links:

https://get.wp.com/ (setting up self-hosting)https://en.support.wordpress.com/monetize-your-site/ (monetizing your site)

Hope this helps! If you need anything else let us know :)