Perhaps one of the most basic pass concepts in modern football, the smash concept was initially developed to take advantage of cover 2 defenses (or really any two high safety defense to a degree). Over the years, it has been adapted to theoretically work against any sort of coverage, but the main reason it's deployed is still to defeat cover 2. You can find info on the smash concept all over the internets.
The reason it is utilized so often for its simplicity is: it is a simple read for the QB who keys a single defender; it's outside the box and congestion that happens within it; it's typically easy to teach safe throws to the sideline.
Much like MSU is known to heavily lean on their cover 4, in the past, Iowa has been that way with cover 2. While they mix it up a bit more under former Spartan and current Iowa Defensive Coordinator Phil Parker than they did with former DC Norm Parker (no relation apparently), they are still favor cover 2. That gives good reason to deploy it here, so let's take a look:
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To continue reading how the smash concept works well for MSU and why, and also take a look at Double Slants, follow the link the The Only Colors