1. The document discusses various educational websites and the types of advertisements displayed on those sites. It provides details about 10 different educational sites, the purpose of each site, and examples of advertisements shown on the sites.
2. Common types of advertisements described include banner ads, flash ads, pop-up ads, and video ads. Placement of ads at the top of pages, in repeated formats, or with animation are said to increase visibility and attractiveness.
3. The ads typically promote other educational resources, courses, exams, or sites related to the target audience of students, teachers, and parents. This helps the ads be more relevant and appealing to those viewing the educational websites.