This is the best ad for content that suits for websites having more contents and wide screen. The size of this ad 728*90 pixel. This displays 4 ads on a display page with url linked below. This is Horizontal ad unit.
Best Placement: You can place this ad above all posts, below your site banner frame.
Suits best for displaying ads between posts, this displays 2 ads on a front page highly related to content in a horizontal manner. Size of this is 468*60 pixel.
Best Placement: Between posts and by side of website banner
3. Half Banner:
This is 234*60 pixel sized banner displaying only one ad unit on a page. This is best suited for sites that can be merged or embedded in a post. This is also Horizontal ad unit
Best Placement: Embedding in posts
Now the vertical ad unit starts. The similar ad unit of leaderboard is skyscrapper but differs only in direction. Size is 120*600 pixels.
Best Placement: Any side panels.
5. Wide skyscrapper:
This is same as skyscrapper, but it describes the ad more detailed than the previous one. Size is 160*600 pixels.
Best Placement: Embedding in content, especially posts which come for the whole page
6.All Rectangles and Squares:
This depicts as if it is a site content. Users will be attracted highly by these ad units.
Best Placement: Either above posts or merged as inline in posts