Ad Formats.
Google AdSense Ad Formats-:
Text Ads,Image Ads,Video Ads,Link Units,Referral buttons

Text Ad Formats-:
Leaderboard (728 x 90),Banner (468 x 60),Button (125x125),Half Banner (234x60),Skyscraper (120x600),Wide Skyscraper (160x600),Small Rectangle (180x150),Vertical Banner (120 x 240),Medium Rectangle (300 x 250),Square (250 x 250),Large Rectangle (336 x 280),

Image Ad Formats-:
Leaderboard (728 x 90),Banner (468 x 60),Wide Skyscraper (160x600),Skyscraper (120x600),Square (250 x 250),Medium Rectangle (300 x 250),Large Rectangle (336 x 280),

Video Ad Formats-:
Square (250x250),Rectangle (300x250),Large Rectangle (336x280)