App blocks let you add app functionality exactly where you want to use it in your theme. You can add, remove, preview, reposition, and customize app blocks through the theme editor.
App blocks are only supported on Shopify Online 2.0 themes if you aren't using a Shopify Online 2.0 theme, please proceed to the manual setup section
Apps can be added both as blocks in a section, and as sections in a template. This lets you add app functionality exactly where you want to use it on a page. App blocks can be added, removed, repositioned, and customized through the theme editor.
More information on app blocks can be found in Shopify's Documentation here.