Making money by running ads online involves creating a platform, such as a website, blog, or YouTube channel, with engaging content that attracts an audience. Once you have a sizable audience, you can sign up for advertising networks like Google AdSense or affiliate programs. These platforms will display relevant ads on your content, and you’ll earn money based on clicks, views, or conversions generated by those ads. Success in this field requires consistent, high-quality content production and effective audience engagement strategies.