AMP HTML is HTML with some unique tags for reliable performance and some extensions for building rich AMP HTML content. AMP HTML is AMP properties and attributes.
The AMP JS library ensures the fast rendering of AMP HTML pages. The AMP JS library implements all of AMP’s best performance practices, manages loading time and gives you the custom tags to ensure a fast rendering of your page.
The Google AMP Cache is a proxy-based content delivery network for delivering all valid AMP documents. It fetches AMP HTML pages, caches them, and improves page performance automatically. When using the Google AMP Cache, the document, all JS files and all images load from the same origin that is using HTTP 2.0 for maximum efficiency.