This document discusses React, ES6, and how to use React with Meteor. It provides an overview of React including its virtual DOM, one-way data flow, and reusable components. It also covers how React supports ES6 features and can be added to Meteor projects using packages. The document demonstrates React through live coding examples and compares React to Blaze, noting differences in components, support for isomorphic code, and use of a virtual DOM. It concludes by mentioning plans for an updated Blaze framework to also support components and a virtual DOM.