Definition:
Recommended by the IAB, these are the big, rectangular-shaped banner formats.
Information:
Particularly, the recent rectangular-shaped ad formats comprise:
300 x 250 IMU (Medium Rectangle)
250 x 250 IMU (Square Pop-up)
240 x 400 IMU (Vertical Rectangle)
336 x 280 IMU (Large Rectangle)
180 x 150 IMU (Rectangle)...