it isn't, but in practice a properly and efficiently designed website is hard to find. And in order for a site like google to be able to surface properly and e

it isn't, but in practice a properly and efficiently designed website is hard to find. And in order for a site like google to be able to surface properly and efficiently designed websites, they need to have some set of rules to differentiate between a properly and efficiently designed site and one that isnt. And that is the simplest definition of AMP: a set of rules to define an efficiently presented news article. and then the continuation of that is that if a news article follows those rules, it is cache-able and google can give it a significant speed boost by serving it from their cache.