The popular website that you can rely on and will allow you to advertise across a collection of websites are Google AdSense and Google Ads. · Google Ads has Google display network (GDN) that consists of many advertisers, who want to advertise their banner ad and many publisher websites which will plot the advertisers banner ads on their website. · Google AdSense is for website owners who want to earn money by placing banner ads on their website. Check out my article if you are planning to start your career in digital marketing.