AMP stands for Accelerated Mobile Pages. You need it in order to offer the fastest mobile load speed and user experience so that you can harness an improved click-through rate.
AMP is different from a mobile version of a page. This is due to having no JavaScript, the removal of banners, background images and the like. The images are basically added using specific AMP coding to make them respond to user’s screen size. It loads quickly and pretty much only includes the core information that the user will need.