Different Ad Formats in Google Adsense

Adsense offer a variety of Adsense Ad formats to allow publisers the flexibility to place ads on any spot on their website. There are currently 10 standard Ad formats and 6 Adlink formats.
The Standard Adsense Ad Formats
Horizontal Ad Formats
1. 728 x 90: Leaderboard2. 468 x 60: Banner3. 234 x 60: Half Banner
Vertical Ad Formats
4. 120 x 600: Skyscraper5. 120 x 140: Vertical Banner
Square Ad Formats
6. 125 x 125: Button7. 300 x 250: Medium Rectangle8. 250 x 250: Square9. 336 x 280: Large Rectangle10. 180 x 150: Small Rectangle
For more information read the article - Adsense Ad Format Optimization.
The Adsense Adlinks Formats
Horizontal Adlink Formats
1. 728 x 152. 468 x 15
Square Adlink Formats
3. 200 x 904. 180 x 905. 160 x 906. 120 x 90
For more information read the article - Adsense Adlink Optimization.