The starter plugin for deploying a JAMstack ecommerce storefront on Netlify, built using Gatsby, allows developers to easily get started with building an integration to the BigCommerce platform. It provides a combination of ecommerce functionality and performance through static sites distributed globally on the Netlify CDN. The plugin uses GraphQL APIs to pull data from the BigCommerce store, enabling merchants to create fast, personalized shopping experiences. With the starter plugin, developers can deploy a fully functional JAMstack ecommerce storefront in under 5 minutes. The tutorial demonstrates how to set up a BigCommerce store, API user, and install dependencies before deploying the storefront on Netlify. It also covers the process of creating product pages using Gatsby and GraphQL queries, as well as adding dynamic content such as an add-to-cart button and cart functionality. Additionally, the tutorial discusses extending the plugin for additional use cases such as multi-branding, internationalization, and embedded checkout.