Whats The Difference Between The Iphone And The Itouch

I know that you can call people on the iphone and not the itouch, but what else is different? For example, do both of them have internet? If so, do you pay extra fees for the internet? Or does it come with the package? Please give information about other applications as well! I'm planning on getting one...don't know which yet...so yeah. Thanks!