Magento 2 Builder Theme is a Magento base theme which is reviewed and approved at Magento Connect. It's developed based on MGS Frontend Builder and tons of extensions, widgets. Using builder theme will help you easily create and build your own store(s) as you want. With MGS - Frontend Builder Panel, It allows you to build and configure Homepage, Category page, Product page, CMS page, Shopping cart page... at frontend visually without having to log in the admin back-end.