Google's Accelerated Mobile Pages project takes your content and delivers it via their infrastructure optimized for mobile devices and slower internet connections.
Web pages with AMP versions may also be highlighted in Google search results pages in a richer format than a regular search result listing.
Activating AMP will automatically make AMP versions of your content available. You can choose which content types to generate AMP versions for through the CMS admin and also opt-out on a per-post basis.
Native mode vs Paired mode vs Classic mode
The following modes can be set from the CMS admin under the AMP menu item.
Native mode will override your default content URLs with the AMP version of the page. Validation errors are fixed automatically.
In paired mode a separate URL is used for the AMP version of your pages and your original page will be the canonical version.
Paired mode is recommended to provide the best user experience to your visitors.
Classic mode uses a completely separate set of templates that will require styling and additional testing to match your main theme.