It's wayyy easier than you may think! One of the reasons is that Android phones are built with what's called an "open operating system", which allows anyone to see and change the way things on the phone get used. Apple, on the other hand, has a "closed operating system" which does not allows this. Also, anyone can sell an Android app from anywhere. Apple requires that anyone writing an app submit their app for review against hacks and viruses before being allowed to sell it. Additionally, all Apple apps are ONLY sold via iTunes to minimize the risk of rogue apps setting out onto the market! Watch this video!
I love technology and how it enhances our lives! Just think, without the Apollo moon missions, we might not have calculators! Imagine!!