Google is the biggest advertiser for the internet. You can use Google Ads as a publisher (running ads on your site) as well as an advertiser (running your ads on the Google platform or google partner website. When you are trying to use Google ads as an advertiser, you can advertise your products and services on various platforms like youtube, Google search, mobile apps, and google partner websites. I have tried Google ads to promote my product and services, and I really liked this platform.