An ad broker is a middleman between advertisers and publishers. These are individuals or media agencies who make their living by finding and negotiating ad spots for advertisers they represent for a fee or percentage of sales from both advertisers and publishers. Ad networks can be referred to as ad brokers as well.
Parallax Scrolling
Parallax scrolling is a technique in website design in which both foreground and background are moving. However, the foreground is moving at a faster pace