Shopify 2.0 is a better-integrated upgrade from the original Shopify Online Store. This version has significantly improved performance metrics and is easier to use with the Shopify App Store, helping you build the functionality you need while maintaining the performance your customers expect.
Upgrading to Shopify 2.0 involves migrating your site from one codebase to another and ensuring your theme and page templates transition seamlessly to the new architecture. This lets you fully benefit from all the enhancements made since the initial release and throughout its updates.