Google AdSense is a Google-based program that enables content website publishers to serve automatic text, image, video or interactive media advertisements targeting site content and audience. Google manages, sorts and maintains these advertisements.
How is AdSense working?
Suppose an advertiser would like to advertise his products like Mobile phones, Home Appliance, laptops, Insurance through Google, so he would bid on some keywords like "Mobiles, computers, Insurance, etc."
If you have applied for AdSense as a publisher and have been approved for it. So if any if any of your articles contain keywords such as "Mobiles, computers, Real estate, etc. “Google AdSense will display the same ads on your blog, Google will be paid if any visitor on your site clicks on those ads. You're finally getting your share.