You'll notice a totally new color palette, with cool pastels and primary colors rather than shades of blue and grey. The philosophy of the design has changed, too; before, Apple used something called "skeumorphism," which basically means trying to make digital things look like physical things. A note-taking app, for example, might have a design with a spiral binding at the top, like a reporter's notebook. This is considered by the tech elite to be a slightly outdated way of designing things; the modern view is that digital doesn't need to look like anything in the real world, but can be simpler and cleaner, without unnecessary flourishes. This sort of philosophy is called "flat design," and the new iOS is a full-on flat design update.