A content provider has posted a video to their website.

1. They arrange a marketing deal with an advertiser to play an advertising video before the real content.
2. The advertisement plays.
3. The real content plays.
4. The advertiser pays for their ad placement.

A content provider has posted images to their website.

1. They arrange a marketing deal with an advertiser to place an advertisement on the site before the real content.
2. The advertisement is displayed.
3. The real content is displayed.
4. The advertiser pays for their ad placement.

A content provider has posted textual content to their website.

1. They arrange a marketing deal with an advertiser to place an advertisement on the site before the real content.
2. The advertisement is displayed.
3. The real content is displayed.
4. The advertiser pays for their ad placement.