I will vote for the best answer based on the use of simple vocabulary, I don't know much about transformers so try to keep it as understandable as possible. I know it's not a simple subject, thanks!
Transformers are made with laminated plates for reasons of magnetic flux, reluctance and heat dissipation. They have been designed by very qualified engineers, more so than I, and have stood the test of time. Try the site below.
cause engineers have decided it's more badas?-looking that way
As you may know, transformers only work with varying current: AC, of whatever frequency. The varying magnetic field produced by one coil will induce a proportional current in the other coil. That's how they work. But the varying magnetic field will also induce currents in the metal core of the transformer. These are called eddy currents, are a waste of energy, and will result in excess heat. By using thin laminations for the core, and insulating the laminations from each other, transformer designers can minimize these eddy currents, and keep the transformer efficient. Don't forget my best answer.