Standard IAB sizes are of great importance in the AdTech industry as they set out the standards and guidelines currently popular with ad sizes for ad units.
Some standard IAB sizes are considered standard ads – leaderboard (728×90), medium ads (300×250), and skyscraper sizes (1600×600).
The standard IAB sizes for ad units are some of the most profitable ad sizes. Some additional profitable ad sizes are, billboard (970×250), smartphone banner (300×50, 320×50), and portraits (300×600). These standard IAB sizes are time-tested by thousands of cases for ensuring maximum engagement with the viewers without hampering their experience or being too intrusive.