What are the differences between iced espresso and iced coffee in terms of flavor, caffeine content, and preparation methods?

Iced espresso is stronger and more concentrated in flavor than iced coffee. It has a higher caffeine content due to the espresso brewing method. Iced coffee is milder in flavor and has less caffeine. Espresso is made by forcing hot water through finely-ground coffee beans, while iced coffee is made by brewing coffee with hot water and then cooling it down.