A Billboard Ad is a wide rectangular banner that measures 970-pixels-wide by 250-pixels-high, it is usually placed at the premium position on the website pages as a push down ads. As it is a very large ad size, they are only available on desktop screens
A Large Leaderboard Ad is a wide rectangular banner that measures 970-pixels-wide by 90-pixels-high, It shares a space with 728x90s as well as 970x250s. As it is a very large ad size, they are only available on desktop screens
A Leaderboard Ad size 728 pixels wide by 90 pixels tall is usually placed at the top of a page, so as to be seen by the user immediately when the page loads. Leaderboard ads are possibly the most valuable/costly as they generally perform really well.
A Large Rectangle Ad size 336 pixels wide by 280 pixels tall. As the name implies, it is essentially the big brother to Medium Rectangle ad unit. It’s more commonly set up as a multi-sized ad slot along with a 300×250.
A Medium Rectangle Ad size 300 pixels wide by 250 pixels tall. It's possibly the best advertising ad available and is, generally the best performing ad size. It is often tempting to place several Medium Rectangles on a single page
A Skyscraper or Halfpage Ad size 300 pixels wide by 600 pixels tall. It can be run in its own ad slot but is more commonly set up as a multi-sized ad slot along with a 300×250. This ad size is usually placed on the side of a page, in the same place a Medium Rectangle would be – with the extra height.
A Portrait Ad size 300 pixels wide by 1050 pixels tall. The Ad Unit is the largest sized Banner Ad currently in market, typically positioned in the right-hand side bar of the website