A banner is an image that serves as advertising material and sends a visitor to an advertiser's website when clicked.
The most common banner formats are:
- 728 x 90 pixels, "leaderboard"
- 468 x 60 pixels, "full banner"
- 300 x 250 pixels, "medium rectangle"
- 336 x 280 pixels, "large rectangle"
- 234 x 60 pixels, "half banner"
- 160 x 600 pixels, "wide skyscraper"
- 120 x 600 pixels, "skyscraper"
- 120 x 60 pixels, "button"
Read more about banners here.