>For example, search advertising in search engines. That is known as intent driven ads, where user is clearly mentioning their intent. Your example is still a

>For example, search advertising in search engines. That is known as intent driven ads, where user is clearly mentioning their intent. Your example is still a "Push" ad. You're pushing your stuff without being asked. Looking for information on a topic is not a request for ads on that topic. A pull ad would be an ad catalogue, or a website built purely for ads where people would go to explore for new things/services/whatever if, and only if, they wanted to.