How is iteration used in engineering design? why is this such an important aspect of the process?

The cycle of prototyping, testing, and refining that's at the core of iterative design offers numerous benefits: Testing gives you a valuable collection of user feedback that you can use to improve your site and to understand what's working for you. It helps you catch problems before they spiral out of control.

it’s previous models   because when i picked that son of a gun’s answer it was wrong look for previous models because they might make it a different letter